formula wt calculator

document.xls Copyright by Brian M. Tissue http://www.chem.vt.edu/chem-ed/a-text/

###ver. 7/26/2009

Copyright 2007-2009 Brian M. Tissue, all rights reserved.

http://www.chem.vt.edu/chem-ed/a-text/

Quick StartClick on the 'calculator' worksheet and enter a chemical formula in the unshaded cells.

Worksheets in this file 'notes' - this page with background information. 'calculator' - calculates formula weight for the entered chemical formula. 'selected compounds' - tabulated formula weights of common laboratory chemicals. 'lookup tables' - lookup tables of atomic and molecular weights used by the formula weight calculation. 'atomic weights' - tabulated atomic weights, isotopic compositions, and physical constants for reference.

Background

A formula weight is the sum of the atomic weights for all atoms in a molecule, e.g.:

at.wt.2 Na 22.98977 = 45.979541 C 12.0107 = 12.01073 O 15.9994 = 47.9982

------------

= 105.9884

Use the displayed atomic weights to determine the correct number of significant figures in the result.

For use with B.M. Tissue, Analytical Chemistry: Chemical Equilibria and Core Concepts.

Na2CO3 F.W.


Formula Weight Calculator

Enter formulas by entering element symbols and subscripts in the unshaded cells. F.W. (g/mol)

Enter Formula: Na 2 C 1 O 3 105.9884atomic wts: 22.98977 12.0107 15.9994 0

Enter Formula: K 2 Cr2O7 1 294.1846atomic wts: 39.0983 215.988 0 0

Enter Formula: K 1 H 1 phthalate 1 204.2212atomic wts: 39.0983 1.00794 164.11496 0

Enter Formula: Fe 1 NH4 2 SO4 2 H2O 6 392.1388atomic wts: 55.845 18.03846 96.0626 18.01528

Enter Formula: C 3 H 7 N 1 O 2 S 1 121.1582atomic wts: 12.0107 1.00794 14.0067 15.9994 32.065

Enter Formula: C 6 H 12 N 2 O 4 S 2 240.3005atomic wts: 12.0107 1.00794 14.0067 15.9994 32.065

Copyright 2007-2009 by Brian M. Tissue, all rights reserved.

http://www.chem.vt.edu/chem-ed/a-text/For use with B.M. Tissue, Analytical Chemistry and Chemical Equilibria.


The following polyatomic ions are in the lookup table:

CO3 MnO4 CH3COO acetateHCO3 MoO4 C2O4 oxalateCN NO2 C8H4O4 phthalate

BrO NO3 C9H6NO quinolinolateBrO2 OH NH4BrO3 PO4 Hg2

ClO HPO4ClO2 H2PO4ClO3 NH4PO4

ClO4 P2O7CrO4 SCNCr2O7 SO3

IO SO4IO3 S2O3IO4 S2O8

H2O(use H2O for hydrates)


Formula Weight of Selected Compounds(scroll down for common acids and bases)

F.W. Chemical symbols are pulled from lookup tables. SALTS (alphabetical by name) (g/mol) Enter numerical values manually.

Al aluminum acetate 204.11360 Al 1 CH3COO 3 aluminum chloride 133.34054 Al 1 Cl 3 aluminum hydroxide 78.00356 Al 1 OH 3 aluminum oxide 101.96128 Al 2 O 3 aluminum phosphate 121.95290 Al 1 PO4 1 aluminum quinolinolate 459.43166 Al 1 C9H6NO 3

NH4 ammonium acetate 77.08248 NH4 1 CH3COO 1 ammonium bromide 97.94246 NH4 1 Br 1 ammonium carbonate 96.08582 NH4 2 CO3 1 ammonium hydrogencarbonate 79.05530 NH4 1 HCO3 1 ammonium chloride 53.49146 NH4 1 Cl 1 ammonium iodide 144.94293 NH4 1 I 1 ammonium hydroxide 35.04580 NH4 1 OH 1 ammonium nitrate 80.04336 NH4 1 NO3 1 ammonium phosphate 149.08674 NH4 3 PO4 1 ammonium sulfate 132.13952 NH4 2 SO4 1

Ba barium acetate 196.37102 Ba 1 CH3COO 1 barium carbonate 197.33590 Ba 1 CO3 1 barium chloride 208.23300 Ba 1 Cl 2 barium chromate 253.32070 Ba 1 CrO4 1 barium fluoride 175.32381 Ba 1 F 2 barium hydroxide 171.34168 Ba 1 OH 2 barium hydroxide hydrate 315.46392 Ba 1 OH 2 H2O 8barium iodate 487.13234 Ba 1 IO3 2 barium nitrate 261.33680 Ba 1 NO3 2 barium oxalate 225.34600 Ba 1 C2O4 1 barium phosphate 601.92372 Ba 3 PO4 2 barium sulfate 233.38960 Ba 1 SO4 1

Bi bismuth acetate 386.11244 Bi 1 CH3COO 3


bismuth hydroxide 260.00240 Bi 1 OH 3 bismuth phosphate 303.95174 Bi 1 PO4 1 bismuth sulfide 514.15576 Bi 2 S 3

Cd cadmium acetate 230.49904 Cd 1 CH3COO 2 cadmium carbonate 172.41990 Cd 1 CO3 1 cadmium fluoride 150.40781 Cd 1 F 2 cadmium hydroxide 146.42568 Cd 1 OH 2 cadmium oxalate 200.43000 Cd 1 C2O4 1 cadmium oxalate hydrate 254.47584 Cd 1 C2O4 1 H2O 3cadmium phosphate 527.17572 Cd 3 PO4 2 cadmium sulfate 208.47360 Cd 1 SO4 1 cadmium sulfide 144.47600 Cd 1 S 1

Ca calcium acetate 158.16604 Ca 1 CH3COO 2 calcium bromide 199.88600 Ca 1 Br 2 calcium carbonate 100.08690 Ca 1 CO3 1 calcium chloride 110.98400 Ca 1 Cl 2 calcium chromate 156.07170 Ca 1 CrO4 1 calcium cyanide 92.11280 Ca 1 CN 2 calcium dichromate 256.06600 Ca 1 Cr2O7 1 calcium fluoride 78.07481 Ca 1 F 2 calcium hydroxide 74.09268 Ca 1 OH 2 calcium iodide 293.88694 Ca 1 I 2 calcium nitrate 164.08780 Ca 1 NO3 2 calcium oxalate hydrate 146.11228 Ca 1 C2O4 1 H2O 1calcium oxide 56.07740 Ca 1 O 1 calcium phosphate 310.17672 Ca 3 PO4 2 calcium sulfate 136.14060 Ca 1 SO4 1 calcium thiocyanate 156.24280 Ca 1 SCN 2 calcium acetate 158.16604 Ca 1 CH3COO 2

Ce cerium(III) acetate 317.24806 Ce 1 CH3COO 3 cerium(III) hydroxide 191.13802 Ce 1 OH 3 cerium(III) iodate 664.82401 Ce 1 IO3 3 cerium(III) oxalate 544.28900 Ce 2 C2O4 3 cerium(III) oxalate hydrate 706.42652 Ce 2 C2O4 3 H2O 9cerium(III) phosphate 235.08736 Ce 1 PO4 1


Ce cerium(IV) acetate 376.29208 Ce 1 CH3COO 4 cerium(IV) hydroxide 208.14536 Ce 1 OH 4 cerium(IV) iodate 839.72668 Ce 1 IO3 4

Cr chromium(III) acetate 229.12816 Cr 1 CH3COO 3 chromium(III) fluoride 108.99131 Cr 1 F 3 chromium(III) hydroxide 103.01812 Cr 1 OH 3

Co cobalt(II) acetate 177.02124 Co 1 CH3COO 2 cobalt(II) carbonate 118.94210 Co 1 CO3 1 cobalt(II) iodate 408.73854 Co 1 IO3 2 cobalt(II) phosphate 366.74232 Co 3 PO4 2 cobalt(II) quinolinolate 347.23328 Co 1 C9H6NO 2

Co cobalt(III) acetate 236.06526 Co 1 CH3COO 3 cobalt(III) hydroxide 109.95522 Co 1 OH 3

Cu copper(I) acetate 122.59002 Cu 1 CH3COO 1 copper(I) bromide 143.45000 Cu 1 Br 1 copper(I) chloride 98.99900 Cu 1 Cl 1 copper(I) cyanide 89.56340 Cu 1 CN 1 copper(I) hydroxide 80.55334 Cu 1 OH 1 copper(I) iodide 190.45047 Cu 1 I 1 copper(I) oxide 143.09140 Cu 2 O 1 copper(I) sulfide 159.15700 Cu 2 S 1

Cu copper(II) acetate 181.63404 Cu 1 CH3COO 2 copper(II) carbonate 123.55490 Cu 1 CO3 1 copper(II) chloride 134.45200 Cu 1 Cl 2 copper(II) chromate 179.53970 Cu 1 CrO4 1 copper(II) hydroxide 97.56068 Cu 1 OH 2 copper(II) iodate 413.35134 Cu 1 IO3 2 copper(II) nitrate 187.55580 Cu 1 NO3 2 copper(II) oxalate 151.56500 Cu 1 C2O4 1 copper(II) phosphate 380.58072 Cu 3 PO4 2 copper(II) quinolinolate 351.84608 Cu 1 C9H6NO 2 copper(II) sulfate 159.60860 Cu 1 SO4 1 copper(II) sulfide 95.61100 Cu 1 S 1

Dy dysprosium acetate 339.63206 Dy 1 CH3COO 3 dysprosium hydroxide 213.52202 Dy 1 OH 3


Er erbium acetate 344.39106 Er 1 CH3COO 3 erbium hydroxide 218.28102 Er 1 OH 3

Eu europium acetate 329.09606 Eu 1 CH3COO 3 europium hydroxide 202.98602 Eu 1 OH 3

Gd gadolinium acetate 334.38206 Gd 1 CH3COO 3 gadolinium hydroxide 208.27202 Gd 1 OH 3

Ga gallium acetate 246.85506 Ga 1 CH3COO 3 gallium hydroxide 120.74502 Ga 1 OH 3

Hf hafnium acetate 414.66608 Hf 1 CH3COO 4 hafnium hydroxide 246.51936 Hf 1 OH 4

Ho holmium acetate 342.06238 Ho 1 CH3COO 3 holmium hydroxide 215.95234 Ho 1 OH 3

In indium acetate 291.95006 In 1 CH3COO 3 indium hydroxide 165.84002 In 1 OH 3 indium sulfide 325.83100 In 2 S 3

Fe iron(II) acetate 173.93304 Fe 1 CH3COO 2 iron(II) carbonate 115.85390 Fe 1 CO3 1 iron(II) chloride 126.75100 Fe 1 Cl 2 iron(II) hydroxide 89.85968 Fe 1 OH 2 iron(II) oxalate 143.86400 Fe 1 C2O4 1 iron(II) oxalate hydrate 179.89456 Fe 1 C2O4 1 H2O 2iron(II) disulfide 119.97500 Fe 1 S2 1 iron(II) sulfide 87.91000 Fe 1 S 1

Fe iron(III) acetate 232.97706 Fe 1 CH3COO 3 iron(III) chloride 162.20400 Fe 1 Cl 3 iron(III) hydroxide 106.86702 Fe 1 OH 3 iron(III) oxide 159.68820 Fe 2 O 3 iron(III) phosphate 150.81636 Fe 1 PO4 1 iron(III) phosphate hydrate 186.84692 Fe 1 PO4 1 H2O 2

La lanthanum acetate 316.03756 La 1 CH3COO 3 lanthanum fluoride 195.90071 La 1 F 3 lanthanum hydroxide 189.92752 La 1 OH 3 lanthanum iodate 663.61351 La 1 IO3 3 lanthanum oxalate hydrate 704.00552 La 2 C2O4 3 H2O 9lanthanum phosphate 233.87686 La 1 PO4 1


lanthanum sulfide 374.00600 La 2 S 3 Pb lead(II) acetate 325.28804 Pb 1 CH3COO 2

lead(II) bromide 367.00800 Pb 1 Br 2 lead(II) carbonate 267.20890 Pb 1 CO3 1 lead(II) chloride 278.10600 Pb 1 Cl 2 lead(II) chromate 323.19370 Pb 1 CrO4 1 lead(II) fluoride 245.19681 Pb 1 F 2 lead(II) hydroxide 241.21468 Pb 1 OH 2 lead(II) iodate 557.00534 Pb 1 IO3 2 lead(II) iodide 461.00894 Pb 1 I 2 lead(II) nitrate 331.20980 Pb 1 NO3 2 lead(II) oxalate 295.21900 Pb 1 C2O4 1 lead(II) phosphate 811.54272 Pb 3 PO4 2 lead(II) sulfate 303.26260 Pb 1 SO4 1 lead(II) sulfide 239.26500 Pb 1 S 1 lead(II) thiocyanate 323.36480 Pb 1 SCN 2

Pb lead(IV) acetate 443.37608 Pb 1 CH3COO 4 lead(IV) hydroxide 275.22936 Pb 1 OH 4 lead(IV) oxide 239.19880 Pb 1 O 2

Li lithium acetate 65.98502 Li 1 CH3COO 1 lithium hydroxide 23.94834 Li 1 OH 1

Lu lutetium acetate 352.09906 Lu 1 CH3COO 3 lutetium hydroxide 225.98902 Lu 1 OH 3

Mg magnesium acetate 142.39304 Mg 1 CH3COO 2 magnesium ammonium phosphate 137.31482 Mg 1 NH4 1 PO4 1magnesium ammonium phosphate hydrate 245.40650 Mg 1 NH4 1 PO4 1magnesium bromide 184.11300 Mg 1 Br 2 magnesium carbonate 84.31390 Mg 1 CO3 1 magnesium carbonate hydrate 138.35974 Mg 1 CO3 1 H2O 3magnesium chloride 95.21100 Mg 1 Cl 2 magnesium fluoride 62.30181 Mg 1 F 2 magnesium hydroxide 58.31968 Mg 1 OH 2 magnesium iodate hydrate 446.17146 Mg 1 IO3 2 H2O 4magnesium iodide 278.11394 Mg 1 I 2 magnesium nitrate 148.31480 Mg 1 NO3 2


magnesium diphosphate 222.55332 Mg 2 P2O7 1 magnesium sulfate 120.36760 Mg 1 SO4 1

Mn manganese(II) acetate 173.02609 Mn 1 CH3COO 2 manganese(II) carbonate 114.94695 Mn 1 CO3 1 manganese(II) hydroxide 88.95273 Mn 1 OH 2 manganese(II) oxalate hydrate 178.98761 Mn 1 C2O4 1 H2O 2manganese(II) quinolinolate 343.23813 Mn 1 C9H6NO 2

Mn manganese(III) acetate 232.07011 Mn 1 CH3COO 3 manganese(III) hydroxide 105.96007 Mn 1 OH 3 manganese(III) oxide 157.87430 Mn 2 O 3

Mn manganese(IV) acetate 291.11413 Mn 1 CH3COO 4 manganese(IV) oxide 86.93685 Mn 1 O 2

Hg2 mercury(I) acetate 519.26804 Hg2 1 CH3COO 2 mercury(I) bromide 560.98800 Hg2 1 Br 2 mercury(I) chloride 472.08600 Hg2 1 Cl 2 mercury(I) hydroxide 435.19468 Hg2 1 OH 2 mercury(I) iodide 654.98894 Hg2 1 I 2

Hg mercury(II) acetate 318.67804 Hg 1 CH3COO 2 mercury(II) bromide 360.39800 Hg 1 Br 2 mercury(II) hydroxide 234.60468 Hg 1 OH 2 mercury(II) iodide 454.39894 Hg 1 I 2

Nd neodymium acetate 321.37206 Nd 1 CH3COO 3 neodymium hydroxide 195.26202 Nd 1 OH 3

Ni nickel acetate 176.78144 Ni 1 CH3COO 2 nickel carbonate 118.70230 Ni 1 CO3 1 nickel chloride 129.59940 Ni 1 Cl 2 nickel hydroxide 92.70808 Ni 1 OH 2 nickel iodate 408.49874 Ni 1 IO3 2 nickel oxalate 146.71240 Ni 1 C2O4 1 nickel phosphate 366.02292 Ni 3 PO4 2 nickel quinolinolate 346.99348 Ni 1 C9H6NO 2

K potassium acetate 98.14232 K 1 CH3COO 1 potassium bromide 119.00230 K 1 Br 1 potassium carbonate 138.20550 K 2 CO3 1 potassium hydrogencarbonate 100.11514 K 1 HCO3 1


potassium chloride 74.55130 K 1 Cl 1 potassium chromate 194.19030 K 2 CrO4 1 potassium cyanide 65.11570 K 1 CN 1 potassium dichromate 294.18460 K 2 Cr2O7 1 potassium hexafluorosilicate 220.27252 K 2 SiF6 1 potassium hydrogen phthalate 204.22120 K 1 H 1 C8H4O4 1potassium hydroxide 56.10564 K 1 OH 1 potassium iodate 214.00097 K 1 IO3 1 potassium iodide 166.00277 K 1 I 1 potassium nitrate 101.10320 K 1 NO3 1 potassium oxide 94.19600 K 2 O 1 potassium perchlorate 138.54890 K 1 ClO4 1 potassium permanganate 158.03395 K 1 MnO4 1 potassium phosphate 212.26626 K 3 PO4 1 potassium hydrogenphosphate 174.17590 K 2 HPO4 1 potassium dihydrogenphosphate 136.08554 K 1 H2PO4 1 potassium sulfate 174.25920 K 2 SO4 1 potassium thiocyanate 97.18070 K 1 SCN 1 potassium thiosulfate 190.32480 K 2 S2O3 1

Pr praseodymium acetate 318.03971 Pr 1 CH3COO 3 praseodymium hydroxide 191.92967 Pr 1 OH 3

Rb rubidium acetate 203.55584 Rb 1 CH3COO 2 rubidium hydroxide 119.48248 Rb 1 OH 2

Sm samarium acetate 327.49206 Sm 1 CH3COO 3 samarium hydroxide 201.38202 Sm 1 OH 3

Sc scandium acetate 222.08797 Sc 1 CH3COO 3 scandium fluoride 101.95112 Sc 1 F 3 scandium hydroxide 95.97793 Sc 1 OH 3

Si silicon oxide 60.08430 Si 1 O 2 Ag silver acetate 166.91222 Ag 1 CH3COO 1

silver bromide 187.77220 Ag 1 Br 1 silver chloride 143.32120 Ag 1 Cl 1 silver chromate 331.73010 Ag 2 CrO4 1 silver cyanide 133.88560 Ag 1 CN 1 silver hydroxide 124.87554 Ag 1 OH 1


silver iodate 282.77087 Ag 1 IO3 1 silver iodide 234.77267 Ag 1 I 1 silver nitrate 169.87310 Ag 1 NO3 1 silver oxalate 303.75540 Ag 2 C2O4 1 silver oxide 231.73580 Ag 2 O 1 silver thiocyanate 165.95060 Ag 1 SCN 1

Na sodium acetate 82.03379 Na 1 CH3COO 1 sodium bromide 102.89377 Na 1 Br 1 sodium carbonate 105.98844 Na 2 CO3 1 sodium hydrogencarbonate 84.00661 Na 1 HCO3 1 sodium chloride 58.44277 Na 1 Cl 1 sodium chromate 161.97324 Na 2 CrO4 1 sodium cyanide 49.00717 Na 1 CN 1 sodium dichromate 261.96754 Na 2 Cr2O7 1 sodium hexafluoroaluminate 209.94127 Na 3 AlF6 1 sodium hydroxide 39.99711 Na 1 OH 1 sodium iodate 197.89244 Na 1 IO3 1 sodium iodide 149.89424 Na 1 I 1 sodium nitrate 84.99467 Na 1 NO3 1 sodium oxide 61.97894 Na 2 O 1 sodium phosphate 163.94067 Na 3 PO4 1 sodium hydrogenphosphate 141.95884 Na 2 HPO4 1 sodium dihydrogenphosphate 119.97701 Na 1 H2PO4 1 sodium sulfate 142.04214 Na 2 SO4 1 sodium thiocyanate 81.07217 Na 1 SCN 1 sodium thiosulfate 158.10774 Na 2 S2O3 1 sodium permanganate 141.92542 Na 1 MnO4 1

Sr strontium acetate 205.70804 Sr 1 CH3COO 2 strontium carbonate 147.62890 Sr 1 CO3 1 strontium chromate 203.61370 Sr 1 CrO4 1 strontium fluoride 125.61681 Sr 1 F 2 strontium hydroxide 121.63468 Sr 1 OH 2 strontium iodate 437.42534 Sr 1 IO3 2 strontium iodate hydrate 455.44062 Sr 1 IO3 2 H2O 1strontium oxalate 175.63900 Sr 1 C2O4 1


strontium oxalate hydrate 193.65428 Sr 1 C2O4 1 H2O 1strontium phosphate 452.80272 Sr 3 PO4 2 strontium quinolinolate 375.92008 Sr 1 C9H6NO 2 strontium sulfate 183.68260 Sr 1 SO4 1

Tb terbium acetate 336.05740 Tb 1 CH3COO 3 terbium hydroxide 209.94736 Tb 1 OH 3

Tl thallium(I) acetate 263.42732 Tl 1 CH3COO 1 thallium(I) bromide 284.28730 Tl 1 Br 1 thallium(I) chloride 239.83630 Tl 1 Cl 1 thallium(I) chromate 524.76030 Tl 2 CrO4 1 thallium(I) iodate 379.28597 Tl 1 IO3 1 thallium(I) iodide 331.28777 Tl 1 I 1 thallium(I) nitrate 266.38820 Tl 1 NO3 1 thallium(I) oxalate 496.78560 Tl 2 C2O4 1 thallium(I) sulfide 440.83160 Tl 2 S 1 thallium(I) thiocyanate 262.46570 Tl 1 SCN 1

Tl thallium(III) acetate 381.51536 Tl 1 CH3COO 3 thallium(III) hydroxide 255.40532 Tl 1 OH 3 thallium(III) quinolinolate 636.83342 Tl 1 C9H6NO 3

Th thorium acetate 468.21418 Th 1 CH3COO 4 thorium hydroxide 300.06746 Th 1 OH 4 thorium iodate 931.64878 Th 1 IO3 4 thorium oxalate 408.07610 Th 1 C2O4 2 thorium phosphate 1075.99974 Th 3 PO4 4 thorium hydrogenphosphate 423.99670 Th 1 HPO4 2

Tm thulium acetate 346.06627 Tm 1 CH3COO 3 thulium hydroxide 219.95623 Tm 1 OH 3

Sn tin(II) acetate 236.79804 Sn 1 CH3COO 2 tin(II) hydroxide 152.72468 Sn 1 OH 2 tin(II) sulfide 150.77500 Sn 1 S 1

Sn tin(IV) acetate 354.88608 Sn 1 CH3COO 4 tin(IV) hydroxide 186.73936 Sn 1 OH 4

Ti titanium(III) acetate 224.99906 Ti 1 CH3COO 3 titanium(III) hydroxide 98.88902 Ti 1 OH 3

Ti titanium(IV) oxide hydroxide 97.88108 Ti 1 O 1 OH 2


Y yttrium acetate 266.03791 Y 1 CH3COO 3 yttrium carbonate 357.83840 Y 2 CO3 3 yttrium fluoride 145.90106 Y 1 F 3 yttrium hydroxide 139.92787 Y 1 OH 3 yttrium iodate 613.61386 Y 1 IO3 3 yttrium oxalate 441.86870 Y 2 C2O4 3 yttrium oxide 225.80990 Y 2 O 3

Zn zinc acetate 183.49704 Zn 1 CH3COO 2 zinc carbonate 125.41790 Zn 1 CO3 1 zinc chloride 136.31500 Zn 1 Cl 2 zinc fluoride 103.40581 Zn 1 F 2 zinc hydroxide 99.42368 Zn 1 OH 2 zinc iodate 415.21434 Zn 1 IO3 2 zinc iodate hydrate 451.24490 Zn 1 IO3 2 H2O 2zinc oxalate 153.42800 Zn 1 C2O4 1 zinc oxalate hydrate 277.47756 Zn 1 C2O4 2 H2O 2zinc oxide 81.40840 Zn 1 O 1 zinc phosphate 386.16972 Zn 3 PO4 2 zinc sulfate 161.47160 Zn 1 SO4 1 zinc sulfide 97.47400 Zn 1 S 1

Zr zirconium acetate 327.40008 Zr 1 CH3COO 4 zirconium oxide hydroxide 141.23808 Zr 1 O 1 OH 2zirconium phosphate 653.55744 Zr 3 PO4 4

INORGANIC ACIDS

hydrobromic acid 80.91194 H 1 Br 1hypobromous acid 96.91134 H 1 BrO 1carbonic acid 62.02478 H 2 CO3 1hydrocyanic acid 27.02534 H 1 CN 1hydrochloric acid 36.46094 H 1 Cl 1hypochlorous acid 52.46034 H 1 ClO 1chlorous acid 68.45974 H 1 ClO2 1chloric acid 84.45914 H 1 ClO3 1perchloric acid 100.45854 H 1 ClO4 1


hydrofluoric acid 20.00634 H 1 F 1hydroiodic acid 127.91241 H 1 I 1hypoiodous acid 143.91181 H 1 IO 1iodic acid 175.91061 H 1 IO3 1periodic acid 191.91001 H 1 IO4 1nitrous acid 47.01344 H 1 NO2 1nitric acid 63.01284 H 1 NO3 1phosphoric acid 97.99518 H 3 PO4 1dihydrogen sulfide 34.08088 H 2 S 1sulfurous acid 82.07908 H 2 SO3 1sulfuric acid 98.07848 H 2 SO4 1water 18.01528 H 2 O 1hydrogen peroxide 34.01468 H 2 O 2

ORGANIC ACIDS

acetic acid 60.05196 C 2 H 4 O 2ascorbic acid 176.12412 C 6 H 8 O 6bromoacetic acid 137.94008 C 2 H 2 O 2chloroacetic acid 93.48908 C 2 H 2 O 2dichloroacetic acid 128.94208 C 2 H 2 O 2trichloroacetic acid 164.39508 C 2 H 2 O 2fluoroacetic acid 77.03448 C 2 H 2 O 2iodoacetic acid 184.94055 C 2 H 2 O 2acetylsalicylic acid 180.15742 C 9 H 8 O 4ascorbic acid 176.12412 C 6 H 8 O 6benzoic acid 122.12134 C 7 H 6 O 2butyric acid 88.10512 C 4 H 8 O 2citric acid 192.12352 C 6 H 8 O 7hexanoic acid 116.15828 C 6 H 12 O 2formic acid 46.02538 C 1 H 2 O 2fumaric acid 140.09356 C 6 H 4 O 4lactic acid 90.07794 C 3 H 6 O 3maleic acid 116.07216 C 4 H 4 O 4malic acid 134.08744 C 4 H 6 O 5


malonic acid 116.07216 C 4 H 4 O 4nitrilotriacetic acid 2732.38888 C 222 H 2 O 4oxalic acid 90.03488 C 2 H 2 O 4oxalic acid dihydrate 126.06544 C 2 H 2 O 4pentanoic acid 102.13170 C 5 H 10 O 2phenol 94.11124 C 6 H 6 O 1phthalic acid 166.13084 C 8 H 6 O 4pyruvic acid 88.06206 C 3 H 4 O 3succinic acid 118.08804 C 4 H 6 O 4tartaric acid 134.08744 C 4 H 6 O 5

BASES

ammonia 17.03052 N 1 H 3


Atomic weights for formula weight summation.Do not edit formulas in shaded region.

26.981538 59.04402 0 0 26.981538 35.453 0 0 26.981538 17.00734 0 0 26.981538 15.9994 0 0 26.981538 94.971361 0 0 26.981538 144.15004 0 0 18.03846 59.04402 0 0 18.03846 79.904 0 0 18.03846 60.0089 0 0 18.03846 61.01684 0 0 18.03846 35.453 0 0 18.03846 126.90447 0 0 18.03846 17.00734 0 0 18.03846 62.0049 0 0 18.03846 94.971361 0 0 18.03846 96.0626 0 0 137.327 59.04402 0 0 137.327 60.0089 0 0 137.327 35.453 0 0 137.327 115.9937 0 0 137.327 18.9984032 0 0 137.327 17.00734 0 0 137.327 17.00734 18.01528 0 137.327 174.90267 0 0 137.327 62.0049 0 0 137.327 88.019 0 0 137.327 94.971361 0 0 137.327 96.0626 0 0 208.98038 59.04402 0 0


208.98038 17.00734 0 0 208.98038 94.971361 0 0 208.98038 32.065 0 0 112.411 59.04402 0 0 112.411 60.0089 0 0 112.411 18.9984032 0 0 112.411 17.00734 0 0 112.411 88.019 0 0 112.411 88.019 18.01528 0 112.411 94.971361 0 0 112.411 96.0626 0 0 112.411 32.065 0 0 40.078 59.04402 0 0 40.078 79.904 0 0 40.078 60.0089 0 0 40.078 35.453 0 0 40.078 115.9937 0 0 40.078 26.0174 0 0 40.078 215.988 0 0 40.078 18.9984032 0 0 40.078 17.00734 0 0 40.078 126.90447 0 0 40.078 62.0049 0 0 40.078 88.019 18.01528 0 40.078 15.9994 0 0 40.078 94.971361 0 0 40.078 96.0626 0 0 40.078 58.0824 0 0 40.078 59.04402 0 0 140.116 59.04402 0 0 140.116 17.00734 0 0 140.116 174.90267 0 0 140.116 88.019 0 0 140.116 88.019 18.01528 0 140.116 94.971361 0 0


140.116 59.04402 0 0 140.116 17.00734 0 0 140.116 174.90267 0 0 51.9961 59.04402 0 0 51.9961 18.9984032 0 0 51.9961 17.00734 0 0 58.9332 59.04402 0 0 58.9332 60.0089 0 0 58.9332 174.90267 0 0 58.9332 94.971361 0 0 58.9332 144.15004 0 0 58.9332 59.04402 0 0 58.9332 17.00734 0 0 63.546 59.04402 0 0 63.546 79.904 0 0 63.546 35.453 0 0 63.546 26.0174 0 0 63.546 17.00734 0 0 63.546 126.90447 0 0 63.546 15.9994 0 0 63.546 32.065 0 0 63.546 59.04402 0 0 63.546 60.0089 0 0 63.546 35.453 0 0 63.546 115.9937 0 0 63.546 17.00734 0 0 63.546 174.90267 0 0 63.546 62.0049 0 0 63.546 88.019 0 0 63.546 94.971361 0 0 63.546 144.15004 0 0 63.546 96.0626 0 0 63.546 32.065 0 0 162.5 59.04402 0 0 162.5 17.00734 0 0


167.259 59.04402 0 0 167.259 17.00734 0 0 151.964 59.04402 0 0 151.964 17.00734 0 0 157.25 59.04402 0 0 157.25 17.00734 0 0 69.723 59.04402 0 0 69.723 17.00734 0 0 178.49 59.04402 0 0 178.49 17.00734 0 0 164.93032 59.04402 0 0 164.93032 17.00734 0 0 114.818 59.04402 0 0 114.818 17.00734 0 0 114.818 32.065 0 0 55.845 59.04402 0 0 55.845 60.0089 0 0 55.845 35.453 0 0 55.845 17.00734 0 0 55.845 88.019 0 0 55.845 88.019 18.01528 0 55.845 64.13 0 0 55.845 32.065 0 0 55.845 59.04402 0 0 55.845 35.453 0 0 55.845 17.00734 0 0 55.845 15.9994 0 0 55.845 94.971361 0 0 55.845 94.971361 18.01528 0 138.9055 59.04402 0 0 138.9055 18.9984032 0 0 138.9055 17.00734 0 0 138.9055 174.90267 0 0 138.9055 88.019 18.01528 0 138.9055 94.971361 0 0


138.9055 32.065 0 0 207.2 59.04402 0 0 207.2 79.904 0 0 207.2 60.0089 0 0 207.2 35.453 0 0 207.2 115.9937 0 0 207.2 18.9984032 0 0 207.2 17.00734 0 0 207.2 174.90267 0 0 207.2 126.90447 0 0 207.2 62.0049 0 0 207.2 88.019 0 0 207.2 94.971361 0 0 207.2 96.0626 0 0 207.2 32.065 0 0 207.2 58.0824 0 0 207.2 59.04402 0 0 207.2 17.00734 0 0 207.2 15.9994 0 0 6.941 59.04402 0 0 6.941 17.00734 0 0 174.967 59.04402 0 0 174.967 17.00734 0 0 24.305 59.04402 0 0 24.305 18.03846 94.971361 0

H2O 6 24.305 18.03846 94.971361 18.01528 24.305 79.904 0 0 24.305 60.0089 0 0 24.305 60.0089 18.01528 0 24.305 35.453 0 0 24.305 18.9984032 0 0 24.305 17.00734 0 0 24.305 174.90267 18.01528 0 24.305 126.90447 0 0 24.305 62.0049 0 0


24.305 173.943322 0 0 24.305 96.0626 0 0 54.938049 59.04402 0 0 54.938049 60.0089 0 0 54.938049 17.00734 0 0 54.938049 88.019 18.01528 0 54.938049 144.15004 0 0 54.938049 59.04402 0 0 54.938049 17.00734 0 0 54.938049 15.9994 0 0 54.938049 59.04402 0 0 54.938049 15.9994 0 0 401.18 59.04402 0 0 401.18 79.904 0 0 401.18 35.453 0 0 401.18 17.00734 0 0 401.18 126.90447 0 0 200.59 59.04402 0 0 200.59 79.904 0 0 200.59 17.00734 0 0 200.59 126.90447 0 0 144.24 59.04402 0 0 144.24 17.00734 0 0 58.6934 59.04402 0 0 58.6934 60.0089 0 0 58.6934 35.453 0 0 58.6934 17.00734 0 0 58.6934 174.90267 0 0 58.6934 88.019 0 0 58.6934 94.971361 0 0 58.6934 144.15004 0 0 39.0983 59.04402 0 0 39.0983 79.904 0 0 39.0983 60.0089 0 0 39.0983 61.01684 0 0


39.0983 35.453 0 0 39.0983 115.9937 0 0 39.0983 26.0174 0 0 39.0983 215.988 0 0 39.0983 142.0759192 0 0 39.0983 1.00794 164.11496 0 39.0983 17.00734 0 0 39.0983 174.90267 0 0 39.0983 126.90447 0 0 39.0983 62.0049 0 0 39.0983 15.9994 0 0 39.0983 99.4506 0 0 39.0983 118.935649 0 0 39.0983 94.971361 0 0 39.0983 95.979301 0 0 39.0983 96.987241 0 0 39.0983 96.0626 0 0 39.0983 58.0824 0 0 39.0983 112.1282 0 0 140.90765 59.04402 0 0 140.90765 17.00734 0 0 85.4678 59.04402 0 0 85.4678 17.00734 0 0 150.36 59.04402 0 0 150.36 17.00734 0 0 44.95591 59.04402 0 0 44.95591 18.9984032 0 0 44.95591 17.00734 0 0 28.0855 15.9994 0 0 107.8682 59.04402 0 0 107.8682 79.904 0 0 107.8682 35.453 0 0 107.8682 115.9937 0 0 107.8682 26.0174 0 0 107.8682 17.00734 0 0


107.8682 174.90267 0 0 107.8682 126.90447 0 0 107.8682 62.0049 0 0 107.8682 88.019 0 0 107.8682 15.9994 0 0 107.8682 58.0824 0 0 22.98977 59.04402 0 0 22.98977 79.904 0 0 22.98977 60.0089 0 0 22.98977 61.01684 0 0 22.98977 35.453 0 0 22.98977 115.9937 0 0 22.98977 26.0174 0 0 22.98977 215.988 0 0 22.98977 140.9719572 0 0 22.98977 17.00734 0 0 22.98977 174.90267 0 0 22.98977 126.90447 0 0 22.98977 62.0049 0 0 22.98977 15.9994 0 0 22.98977 94.971361 0 0 22.98977 95.979301 0 0 22.98977 96.987241 0 0 22.98977 96.0626 0 0 22.98977 58.0824 0 0 22.98977 112.1282 0 0 22.98977 118.935649 0 0 87.62 59.04402 0 0 87.62 60.0089 0 0 87.62 115.9937 0 0 87.62 18.9984032 0 0 87.62 17.00734 0 0 87.62 174.90267 0 0 87.62 174.90267 18.01528 0 87.62 88.019 0 0


87.62 88.019 18.01528 0 87.62 94.971361 0 0 87.62 144.15004 0 0 87.62 96.0626 0 0 158.92534 59.04402 0 0 158.92534 17.00734 0 0 204.3833 59.04402 0 0 204.3833 79.904 0 0 204.3833 35.453 0 0 204.3833 115.9937 0 0 204.3833 174.90267 0 0 204.3833 126.90447 0 0 204.3833 62.0049 0 0 204.3833 88.019 0 0 204.3833 32.065 0 0 204.3833 58.0824 0 0 204.3833 59.04402 0 0 204.3833 17.00734 0 0 204.3833 144.15004 0 0 232.0381 59.04402 0 0 232.0381 17.00734 0 0 232.0381 174.90267 0 0 232.0381 88.019 0 0 232.0381 94.971361 0 0 232.0381 95.979301 0 0 168.93421 59.04402 0 0 168.93421 17.00734 0 0 118.71 59.04402 0 0 118.71 17.00734 0 0 118.71 32.065 0 0 118.71 59.04402 0 0 118.71 17.00734 0 0 47.867 59.04402 0 0 47.867 17.00734 0 0 47.867 15.9994 17.00734 0


88.90585 59.04402 0 0 88.90585 60.0089 0 0 88.90585 18.9984032 0 0 88.90585 17.00734 0 0 88.90585 174.90267 0 0 88.90585 88.019 0 0 88.90585 15.9994 0 0 65.409 59.04402 0 0 65.409 60.0089 0 0 65.409 35.453 0 0 65.409 18.9984032 0 0 65.409 17.00734 0 0 65.409 174.90267 0 0 65.409 174.90267 18.01528 0 65.409 88.019 0 0 65.409 88.019 18.01528 0 65.409 15.9994 0 0 65.409 94.971361 0 0 65.409 96.0626 0 0 65.409 32.065 0 0 91.224 59.04402 0 0 91.224 15.9994 17.00734 0 91.224 94.971361 0 0

1.00794 79.904 0 01.00794 95.9034 0 01.00794 60.0089 0 01.00794 26.0174 0 01.00794 35.453 0 01.00794 51.4524 0 01.00794 67.4518 0 01.00794 83.4512 0 01.00794 99.4506 0 0


1.00794 18.9984032 0 01.00794 126.90447 0 01.00794 142.90387 0 01.00794 174.90267 0 01.00794 190.90207 0 01.00794 46.0055 0 01.00794 62.0049 0 01.00794 94.971361 0 01.00794 32.065 0 01.00794 80.0632 0 01.00794 96.0626 0 01.00794 15.9994 0 01.00794 15.9994 0 0

12.0107 1.00794 15.9994 012.0107 1.00794 15.9994 0

Br 1 12.0107 1.00794 15.9994 79.904Cl 1 12.0107 1.00794 15.9994 35.453Cl 2 12.0107 1.00794 15.9994 35.453Cl 3 12.0107 1.00794 15.9994 35.453F 1 12.0107 1.00794 15.9994 18.9984032I 1 12.0107 1.00794 15.9994 126.90447

12.0107 1.00794 15.9994 012.0107 1.00794 15.9994 012.0107 1.00794 15.9994 012.0107 1.00794 15.9994 012.0107 1.00794 15.9994 012.0107 1.00794 15.9994 012.0107 1.00794 15.9994 012.0107 1.00794 15.9994 012.0107 1.00794 15.9994 012.0107 1.00794 15.9994 012.0107 1.00794 15.9994 0


12.0107 1.00794 15.9994 012.0107 1.00794 15.9994 012.0107 1.00794 15.9994 0

H2O 2 12.0107 1.00794 15.9994 18.0152812.0107 1.00794 15.9994 012.0107 1.00794 15.9994 012.0107 1.00794 15.9994 012.0107 1.00794 15.9994 012.0107 1.00794 15.9994 012.0107 1.00794 15.9994 0

14.0067 1.00794 0 0


(Do not edit this page)cation lookup Atomic Weight Lookup Table anion lookup

atomic no. element symbol Atomic Weight charge anion symbol1 hydrogen H 1.00794 hydrogen H2 helium He 4.002602 He3 lithium Li 6.941 Li4 beryllium Be 9.012182 Be5 boron B 10.811 B6 carbon C 12.0107 C7 nitrogen N 14.0067 nitride N8 oxygen O 15.9994 oxide O9 fluorine F 18.9984032 fluoride F10 neon Ne 20.1797 Ne11 sodium Na 22.98977 Na12 magnesium Mg 24.305 Mg13 aluminum Al 26.981538 Al14 silicon Si 28.0855 Si15 phosphorus P 30.973761 P16 sulfur S 32.065 sulfide S17 chlorine Cl 35.453 chloride Cl18 argon Ar 39.948 Ar19 potassium K 39.0983 K20 calcium Ca 40.078 Ca21 scandium Sc 44.95591 Sc22 titanium Ti 47.867 Ti23 vanadium V 50.9415 V24 chromium Cr 51.9961 Cr25 manganese Mn 54.938049 Mn26 iron Fe 55.845 Fe27 cobalt Co 58.9332 Co28 nickel Ni 58.6934 Ni29 copper Cu 63.546 Cu30 zinc Zn 65.409 Zn31 gallium Ga 69.723 Ga32 germanium Ge 72.64 Ge33 arsenic As 74.9216 As34 selenium Se 78.96 Se35 bromine Br 79.904 bromide Br


36 krypton Kr 83.798 Kr37 rubidium Rb 85.4678 Rb38 strontium Sr 87.62 Sr39 yttrium Y 88.90585 Y40 zirconium Zr 91.224 Zr41 niobium Nb 92.90638 Nb42 molybdenum Mo 95.94 Mo43 technetium Tc 98 Tc44 ruthenium Ru 101.07 Ru45 rhodium Rh 102.9055 Rh46 palladium Pd 106.42 Pd47 silver Ag 107.8682 Ag48 cadmium Cd 112.411 Cd49 indium In 114.818 In50 tin Sn 118.71 Sn51 antimony Sb 121.76 Sb52 tellurium Te 127.6 Te53 iodine I 126.90447 iodide I54 xenon Xe 131.293 Xe55 cesium Cs 132.90545 Cs56 barium Ba 137.327 Ba57 lanthanum La 138.9055 La58 cerium Ce 140.116 Ce59 praseodymium Pr 140.90765 Pr60 neodymium Nd 144.24 Nd61 promethium Pm 145 Pm62 samarium Sm 150.36 Sm63 europium Eu 151.964 Eu64 gadolinium Gd 157.25 Gd65 terbium Tb 158.92534 Tb66 dysprosium Dy 162.5 Dy67 holmium Ho 164.93032 Ho68 erbium Er 167.259 Er69 thulium Tm 168.93421 Tm70 ytterbium Yb 173.04 Yb71 lutetium Lu 174.967 Lu72 hafnium Hf 178.49 Hf73 tantalum Ta 180.9479 Ta74 tungsten W 183.84 W


75 rhenium Re 186.207 Re76 osmium Os 190.23 Os77 iridium Ir 192.217 Ir78 platinum Pt 195.078 Pt79 gold Au 196.96655 Au80 mercury Hg 200.59 Hg81 thallium Tl 204.3833 Tl82 lead Pb 207.2 Pb83 bismuth Bi 208.98038 Bi84 polonium Po 209 Po85 astatine At 210 At86 radon Rn 222 Rn87 francium Fr 223 Fr88 radium Ra 226 Ra89 actinium Ac 227 Ac90 thorium Th 232.0381 Th91 protactinium Pa 231.03588 Pa92 uranium U 238.02891 U93 neptunium Np 237 Np94 plutonium Pu 244 Pu95 americium Am 243 Am96 curium Cm 247 Cm97 berkelium Bk 247 Bk98 californium Cf 251 Cf99 einsteinium Es 252 Es100 fermium Fm 257 Fm101 mendelevium Md 258 Md102 nobelium No 259 No103 lawrencium Lr 262 Lr104 rutherfordium Rf 261 Rf105 dubnium Db 262 Db106 seaborgium Sg 266 Sg107 bohrium Bh 264 Bh108 hassium Hs 277 Hs109 meitnerium Mt 268 Mt110 darmstadtium Ds 281 Ds

multivalent metals: cerium(III) Ce 3cerium(IV) Ce 4


chromium(III) Cr 3cobalt(II) Co 2cobalt(III) Co 3copper(I) Cu 1copper(II) Cu 2iron(II) Fe 2iron(III) Fe 3lead(II) Pb 2lead(IV) Pb 4manganese(II) Mn 2manganese(III) Mn 3manganese(IV) Mn 4mercury(I) Hg2 401.18 2 mercury(I) Hg2mercury(II) Hg 2tin(II) Sn 2tin(IV) Sn 4thallium(I) Tl 1thallium(III) Tl 3titanium(III) Ti 3titanium(IV) Ti 4

polyatomic cations: ammonium NH4 18.03846 1 ammonium NH4

polyatomic anions: CO3 60.0089 carbonate CO3HCO3 61.01684 hydrogencarbonate HCO3CN 26.0174 cyanide CNBrO 95.9034 hypobromite BrOBrO2 95.9034 bromite BrO2BrO3 127.9022 bromate BrO3ClO 51.4524 hypochlorite ClOClO2 67.4518 chlorite ClO2ClO3 83.4512 chlorate ClO3ClO4 99.4506 perchlorate ClO4CrO4 115.9937 chromate CrO4Cr2O7 215.988 dichromate Cr2O7SiF6 142.0759192 hexafluorosilicate SiF6AlF6 140.9719572 hexafluoroaluminate AlF6


IO 142.90387 hypoiodite IOIO3 174.90267 iodate IO3IO4 190.90207 periodate IO4H2O 18.01528 hydrate H2OMnO4 118.935649 permanganate MnO4MoO4 159.9376 molybdate MoO4NO2 46.0055 nitrite NO2NO3 62.0049 nitrate NO3OH 17.00734 hydroxide OHPO4 94.971361 phosphate PO4HPO4 95.979301 hydrogenphosphate HPO4H2PO4 96.987241 dihydrogenphosphate H2PO4NH4PO4 113.009821 ammoniumphosphate NH4PO4P2O7 173.943322 diphosphate P2O7S2 64.13 disulfide S2SCN 58.0824 thiocyanate SCNSO3 80.0632 sulfite SO3SO4 96.0626 sulfate SO4S2O3 112.1282 thiosulfate S2O3S2O7 176.1258 disulfate S2O7S2O8 192.1252 peroxydisulfate S2O8WO4 247.8376 tungstate WO4CH3COO 59.04402 acetate CH3COOC2O4 88.019 oxalate C2O4C8H4O4 164.11496 phthalate C8H4O4C9H6NO 144.15004 quinolinolate C9H6NO

misc names: acetate 59.04402oxalate 88.019phthalate 164.11496quinolinolate 144.15004


charge1

21

21

1


1


2 401.1800 Hg 2 200.59 0 0 0

1 18.0385 N 1 14.0067 H 4 1.00794 0 0

formula wt2 60.0089 C 1 12.0107 O 3 15.9994 0 01 61.0168 H 1 1.00794 C 1 12.0107 O 3 15.9994 01 26.0174 C 1 12.0107 N 1 14.0067 0 01 95.9034 Br 1 79.904 O 1 15.9994 0 01 95.9034 Br 1 79.904 O 1 15.9994 0 01 127.9022 Br 1 79.904 O 3 15.9994 0 01 51.4524 Cl 1 35.453 O 1 15.9994 0 01 67.4518 Cl 1 35.453 O 2 15.9994 0 01 83.4512 Cl 1 35.453 O 3 15.9994 0 01 99.4506 Cl 1 35.453 O 4 15.9994 0 02 115.9937 Cr 1 51.9961 O 4 15.9994 0 02 215.9880 Cr 2 51.9961 O 7 15.9994 0 02 142.0759 Si 1 28.0855 F 6 18.998403 0 03 140.9720 Al 1 26.981538 F 6 18.998403 0 0


1 142.9039 I 1 126.90447 O 1 15.9994 0 01 174.9027 I 1 126.90447 O 3 15.9994 0 01 190.9021 I 1 126.90447 O 4 15.9994 0 00 18.0153 H 2 1.00794 O 1 15.9994 0 01 118.9356 Mn 1 54.938049 O 4 15.9994 0 02 159.9376 Mo 1 95.94 O 4 15.9994 0 01 46.0055 N 1 14.0067 O 2 15.9994 0 01 62.0049 N 1 14.0067 O 3 15.9994 0 01 17.0073 H 1 1.00794 O 1 15.9994 0 03 94.9714 P 1 30.973761 O 4 15.9994 0 02 95.9793 P 1 30.973761 O 4 15.9994 H 1 1.00794 01 96.9872 P 1 30.973761 O 4 15.9994 H 2 1.00794 02 113.0098 N 1 14.0067 H 4 1.00794 P 1 30.973761 O 4 15.99944 173.9433 P 2 30.973761 O 7 15.9994 0 02 64.1300 S 2 32.065 0 0 01 58.0824 S 1 32.065 C 1 12.0107 N 1 14.0067 02 80.0632 S 1 32.065 O 3 15.9994 0 02 96.0626 S 1 32.065 O 4 15.9994 0 02 112.1282 S 2 32.065 O 3 15.9994 0 02 176.1258 S 2 32.065 O 7 15.9994 0 02 192.1252 S 2 32.065 O 8 15.9994 0 02 247.8376 W 1 183.84 O 4 15.9994 0 01 59.0440 C 2 12.0107 H 3 1.00794 O 2 15.9994 02 88.0190 C 2 12.0107 O 4 15.9994 0 02 164.1150 C 8 12.0107 H 4 1.00794 O 4 15.9994 01 144.1500 C 9 12.0107 H 6 1.00794 N 1 14.0067 O 1 15.9994


Atomic Weights and Isotopic Compositions for All Elements (worksheet updated 5/22/07)

Values from:

Available: http://physics.nist.gov/Comp. National Institute of Standards and Technology, Gaithersburg, MD.Originally published as

A number in parentheses indicates the uncertainty in the last digit of the atomic weight.

Relative Isotopic StandardIsotope Atomic Mass Composition Atomic Weight

1 H 1 1.0078250321(4) 99.9885(70) 1.00794(7)D 2 2.0141017780(4) 0.0115(70)T 3 3.0160492675(11)

2 He 3 3.0160293097(9) 0.000137(3) 4.002602(2)4 4.0026032497(10) 99.999863(3)

3 Li 6 6.0151223(5) 7.59(4) 6.941(2)7 7.0160040(5) 92.41(4)

4 Be 9 9.0121821(4) 100 9.012182(3)

5 B 10 10.0129370(4) 19.9(7) 10.811(7)11 11.0093055(5) 80.1(7)

6 C 12 12.0000000(0) 98.93(8) 12.0107(8)13 13.0033548378(10) 1.07(8)14 14.003241988(4)

7 N 14 14.0030740052(9) 99.632(7) 14.0067(2)15 15.0001088984(9) 0.368(7)

8 O 16 15.9949146221(15) 99.757(16) 15.9994(3)

Coursey, J.S., Schwab, D.J., and Dragoset, R.A. (2005), Atomic Weights and Isotopic Compositions (version 2.4.1). [Online]

Coplen, T.B. "Atomic Weights of the Elements 1999," Pure Appl. Chem., 2001, 73(4), 667; Rosman, K.J.R.; Taylor, P.D.P. "Isotopic Compositions of the Elements 1997," J. Phys. Chem. Ref. Data, 1998, 27(6), 1275;and Audi, G.; Wapstra, A.H. "The 1995 Update To The Atomic Mass Evaluation," Nuclear Physics A, 1995, 595(4), 409.


17 16.99913150(22) 0.038(1)18 17.9991604(9) 0.205(14)

9 F 19 18.99840320(7) 100 18.9984032(5)

10 Ne 20 19.9924401759(20) 90.48(3) 20.1797(6)21 20.99384674(4) 0.27(1)22 21.99138551(23) 9.25(3)

11 Na 23 22.98976967(23) 100 22.989770(2)

12 Mg 24 23.98504190(20) 78.99(4) 24.3050(6)25 24.98583702(20) 10.00(1)26 25.98259304(21) 11.01(3)

13 Al 27 26.98153844(14) 100 26.981538(2)

14 Si 28 27.9769265327(20) 92.2297(7) 28.0855(3)29 28.97649472(3) 4.6832(5)30 29.97377022(5) 3.0872(5)

15 P 31 30.97376151(20) 100 30.973761(2)

16 S 32 31.97207069(12) 94.93(31) 32.065(5)33 32.97145850(12) 0.76(2)34 33.96786683(11) 4.29(28)36 35.96708088(25) 0.02(1)

17 Cl 35 34.96885271(4) 75.78(4) 35.453(2)37 36.96590260(5) 24.22(4)

18 Ar 36 35.96754628(27) 0.3365(30) 39.948(1)38 37.9627322(5) 0.0632(5)40 39.962383123(3) 99.6003(30)

19 K 39 38.9637069(3) 93.2581(44) 39.0983(1)40 39.96399867(29) 0.0117(1)41 40.96182597(28) 6.7302(44)


20 Ca 40 39.9625912(3) 96.941(156) 40.078(4)42 41.9586183(4) 0.647(23)43 42.9587668(5) 0.135(10)44 43.9554811(9) 2.086(110)46 45.9536928(25) 0.004(3)48 47.952534(4) 0.187(21)

21 Sc 45 44.9559102(12) 100 44.955910(8)

22 Ti 46 45.9526295(12) 8.25(3) 47.867(1)47 46.9517638(10) 7.44(2)48 47.9479471(10) 73.72(3)49 48.9478708(10) 5.41(2)50 49.9447921(11) 5.18(2)

23 V 50 49.9471628(14) 0.250(4) 50.9415(1)51 50.9439637(14) 99.750(4)

24 Cr 50 49.9460496(14) 4.345(13) 51.9961(6)52 51.9405119(15) 83.789(18)53 52.9406538(15) 9.501(17)54 53.9388849(15) 2.365(7)

25 Mn 55 54.9380496(14) 100 54.938049(9)

26 Fe 54 53.9396148(14) 5.845(35) 55.845(2)56 55.9349421(15) 91.754(36)57 56.9353987(15) 2.119(10)58 57.9332805(15) 0.282(4)

27 Co 59 58.9332002(15) 100 58.933200(9)

28 Ni 58 57.9353479(15) 68.0769(89) 58.6934(2)60 59.9307906(15) 26.2231(77)61 60.9310604(15) 1.1399(6)62 61.9283488(15) 3.6345(17)64 63.9279696(16) 0.9256(9)

29 Cu 63 62.9296011(15) 69.17(3) 63.546(3)


65 64.9277937(19) 30.83(3)

30 Zn 64 63.9291466(18) 48.63(60) 65.409(4)66 65.9260368(16) 27.90(27)67 66.9271309(17) 4.10(13)68 67.9248476(17) 18.75(51)70 69.925325(4) 0.62(3)

31 Ga 69 68.925581(3) 60.108(9) 69.723(1)71 70.9247050(19) 39.892(9)

32 Ge 70 69.9242504(19) 20.84(87) 72.64(1)72 71.9220762(16) 27.54(34)73 72.9234594(16) 7.73(5)74 73.9211782(16) 36.28(73)76 75.9214027(16) 7.61(38)

33 As 75 74.9215964(18) 100 74.92160(2)

34 Se 74 73.9224766(16) 0.89(4) 78.96(3)76 75.9192141(16) 9.37(29)77 76.9199146(16) 7.63(16)78 77.9173095(16) 23.77(28)80 79.9165218(20) 49.61(41)82 81.9167000(22) 8.73(22)

35 Br 79 78.9183376(20) 50.69(7) 79.904(1)81 80.916291(3) 49.31(7)

36 Kr 78 77.920386(7) 0.35(1) 83.798(2)80 79.916378(4) 2.28(6)82 81.9134846(28) 11.58(14)83 82.914136(3) 11.49(6)84 83.911507(3) 57.00(4)86 85.9106103(12) 17.30(22)

37 Rb 85 84.9117893(25) 72.17(2) 85.4678(3)87 86.9091835(27) 27.83(2)


38 Sr 84 83.913425(4) 0.56(1) 87.62(1)86 85.9092624(24) 9.86(1)87 86.9088793(24) 7.00(1)88 87.9056143(24) 82.58(1)

39 Y 89 88.9058479(25) 100 88.90585(2)

40 Zr 90 89.9047037(23) 51.45(40) 91.224(2)91 90.9056450(23) 11.22(5)92 91.9050401(23) 17.15(8)94 93.9063158(25) 17.38(28)96 95.908276(3) 2.80(9)

41 Nb 93 92.9063775(24) 100 92.90638(2)

42 Mo 92 91.906810(4) 14.84(35) 95.94(2)94 93.9050876(20) 9.25(12)95 94.9058415(20) 15.92(13)96 95.9046789(20) 16.68(2)97 96.9060210(20) 9.55(8)98 97.9054078(20) 24.13(31)100 99.907477(6) 9.63(23)

43 Tc 97 96.906365(5) [98]98 97.907216(4)99 98.9062546(21)

44 Ru 96 95.907598(8) 5.54(14) 101.07(2)98 97.905287(7) 1.87(3)99 98.9059393(21) 12.76(14)100 99.9042197(22) 12.60(7)101 100.9055822(22) 17.06(2)102 101.9043495(22) 31.55(14)104 103.905430(4) 18.62(27)

45 Rh 103 102.905504(3) 100 102.90550(2)

46 Pd 102 101.905608(3) 1.02(1) 106.42(1)104 103.904035(5) 11.14(8)


105 104.905084(5) 22.33(8)106 105.903483(5) 27.33(3)108 107.903894(4) 26.46(9)110 109.905152(12) 11.72(9)

47 Ag 107 106.905093(6) 51.839(8) 107.8682(2)109 108.904756(3) 48.161(8)

48 Cd 106 105.906458(6) 1.25(6) 112.411(8)108 107.904183(6) 0.89(3)110 109.903006(3) 12.49(18)111 110.904182(3) 12.80(12)112 111.9027572(30) 24.13(21)113 112.9044009(30) 12.22(12)114 113.9033581(30) 28.73(42)116 115.904755(3) 7.49(18)

49 In 113 112.904061(4) 4.29(5) 114.818(3)115 114.903878(5) 95.71(5)

50 Sn 112 111.904821(5) 0.97(1) 118.710(7)114 113.902782(3) 0.66(1)115 114.903346(3) 0.34(1)116 115.901744(3) 14.54(9)117 116.902954(3) 7.68(7)118 117.901606(3) 24.22(9)119 118.903309(3) 8.59(4)120 119.9021966(27) 32.58(9)122 121.9034401(29) 4.63(3)124 123.9052746(15) 5.79(5)

51 Sb 121 120.9038180(24) 57.21(5) 121.760(1)123 122.9042157(22) 42.79(5)

52 Te 120 119.904020(11) 0.09(1) 127.60(3)122 121.9030471(20) 2.55(12)123 122.9042730(19) 0.89(3)124 123.9028195(16) 4.74(14)125 124.9044247(20) 7.07(15)


126 125.9033055(20) 18.84(25)128 127.9044614(19) 31.74(8)130 129.9062228(21) 34.08(62)

53 I 127 126.904468(4) 100 126.90447(3)

54 Xe 124 123.9058958(21) 0.09(1) 131.293(6)126 125.904269(7) 0.09(1)128 127.9035304(15) 1.92(3)129 128.9047795(9) 26.44(24)130 129.9035079(10) 4.08(2)131 130.9050819(10) 21.18(3)132 131.9041545(12) 26.89(6)134 133.9053945(9) 10.44(10)136 135.907220(8) 8.87(16)

55 Cs 133 132.905447(3) 100 132.90545(2)

56 Ba 130 129.906310(7) 0.106(1) 137.327(7)132 131.905056(3) 0.101(1)134 133.904503(3) 2.417(18)135 134.905683(3) 6.592(12)136 135.904570(3) 7.854(24)137 136.905821(3) 11.232(24)138 137.905241(3) 71.698(42)

57 La 138 137.907107(4) 0.090(1) 138.9055(2)139 138.906348(3) 99.910(1)

58 Ce 136 135.907140(50) 0.185(2) 140.116(1)138 137.905986(11) 0.251(2)140 139.905434(3) 88.450(51)142 141.909240(4) 11.114(51)

59 Pr 141 140.907648(3) 100 140.90765(2)

60 Nd 142 141.907719(3) 27.2(5) 144.24(3)143 142.909810(3) 12.2(2)144 143.910083(3) 23.8(3)


145 144.912569(3) 8.3(1)146 145.913112(3) 17.2(3)148 147.916889(3) 5.7(1)150 149.920887(4) 5.6(2)

61 Pm 145 144.912744(4) [145]147 146.915134(3)

62 Sm 144 143.911995(4) 3.07(7) 150.36(3)147 146.914893(3) 14.99(18)148 147.914818(3) 11.24(10)149 148.917180(3) 13.82(7)150 149.917271(3) 7.38(1)152 151.919728(3) 26.75(16)154 153.922205(3) 22.75(29)

63 Eu 151 150.919846(3) 47.81(3) 151.964(1)153 152.921226(3) 52.19(3)

64 Gd 152 151.919788(3) 0.20(1) 157.25(3)154 153.920862(3) 2.18(3)155 154.922619(3) 14.80(12)156 155.922120(3) 20.47(9)157 156.923957(3) 15.65(2)158 157.924101(3) 24.84(7)160 159.927051(3) 21.86(19)

65 Tb 159 158.925343(3) 100 158.92534(2)

66 Dy 156 155.924278(7) 0.06(1) 162.500(1)158 157.924405(4) 0.10(1)160 159.925194(3) 2.34(8)161 160.926930(3) 18.91(24)162 161.926795(3) 25.51(26)163 162.928728(3) 24.90(16)164 163.929171(3) 28.18(37)

67 Ho 165 164.930319(3) 100 164.93032(2)


68 Er 162 161.928775(4) 0.14(1) 167.259(3)164 163.929197(4) 1.61(3)166 165.930290(3) 33.61(35)167 166.932045(3) 22.93(17)168 167.932368(3) 26.78(26)170 169.935460(3) 14.93(27)

69 Tm 169 168.934211(3) 100 168.93421(2)

70 Yb 168 167.933894(5) 0.13(1) 173.04(3)170 169.934759(3) 3.04(15)171 170.936322(3) 14.28(57)172 171.9363777(30) 21.83(67)173 172.9382068(30) 16.13(27)174 173.9388581(30) 31.83(92)176 175.942568(3) 12.76(41)

71 Lu 175 174.9407679(28) 97.41(2) 174.967(1)176 175.9426824(28) 2.59(2)

72 Hf 174 173.940040(3) 0.16(1) 178.49(2)176 175.9414018(29) 5.26(7)177 176.9432200(27) 18.60(9)178 177.9436977(27) 27.28(7)179 178.9458151(27) 13.62(2)180 179.9465488(27) 35.08(16)

73 Ta 180 179.947466(3) 0.012(2) 180.9479(1)181 180.947996(3) 99.988(2)

74 W 180 179.946706(5) 0.12(1) 183.84(1)182 181.948206(3) 26.50(16)183 182.9502245(29) 14.31(4)184 183.9509326(29) 30.64(2)186 185.954362(3) 28.43(19)

75 Re 185 184.9529557(30) 37.40(2) 186.207(1)187 186.9557508(30) 62.60(2)


76 Os 184 183.952491(3) 0.02(1) 190.23(3)186 185.953838(3) 1.59(3)187 186.9557479(30) 1.96(2)188 187.9558360(30) 13.24(8)189 188.9581449(30) 16.15(5)190 189.958445(3) 26.26(2)192 191.961479(4) 40.78(19)

77 Ir 191 190.960591(3) 37.3(2) 192.217(3)193 192.962924(3) 62.7(2)

78 Pt 190 189.959930(7) 0.014(1) 195.078(2)192 191.961035(4) 0.782(7)194 193.962664(3) 32.967(99)195 194.964774(3) 33.832(10)196 195.964935(3) 25.242(41)198 197.967876(4) 7.163(55)

79 Au 197 196.966552(3) 100 196.96655(2)

80 Hg 196 195.965815(4) 0.15(1) 200.59(2)198 197.966752(3) 9.97(20)199 198.968262(3) 16.87(22)200 199.968309(3) 23.10(19)201 200.970285(3) 13.18(9)202 201.970626(3) 29.86(26)204 203.973476(3) 6.87(15)

81 Tl 203 202.972329(3) 29.524(14) 204.3833(2)205 204.974412(3) 70.476(14)

82 Pb 204 203.973029(3) 1.4(1) 207.2(1)206 205.974449(3) 24.1(1)207 206.975881(3) 22.1(1)208 207.976636(3) 52.4(1)

83 Bi 209 208.980383(3) 100 208.98038(2)

84 Po 209 208.982416(3) [209]


210 209.982857(3)

85 At 210 209.987131(9) [210]211 210.987481(4)

86 Rn 211 210.990585(8) [222]220 220.0113841(29)222 222.0175705(27)

87 Fr 223 223.0197307(29) [223]

88 Ra 223 223.018497(3) [226]224 224.0202020(29)226 226.0254026(27)228 228.0310641(27)

89 Ac 227 227.0277470(29) [227]

90 Th 230 230.0331266(22) 232.0381(1)232 232.0380504(22) 100

91 Pa 231 231.0358789(28) 100 231.03588(2)

92 U 233 233.039628(3) 238.02891(3)234 234.0409456(21) 0.0055(2)235 235.0439231(21) 0.7200(51)236 236.0455619(21)238 238.0507826(21) 99.2745(106)

93 Np 237 237.0481673(21) [237]239 239.0529314(23)

94 Pu 238 238.0495534(21) [244]239 239.0521565(21)240 240.0538075(21)241 241.0568453(21)242 242.0587368(21)244 244.064198(5)


95 Am 241 241.0568229(21) [243]243 243.0613727(23)

96 Cm 243 243.0613822(24) [247]244 244.0627463(21)245 245.0654856(29)246 246.0672176(24)247 247.070347(5)248 248.072342(5)

97 Bk 247 247.070299(6) [247]249 249.074980(3)

98 Cf 249 249.074847(3) [251]250 250.0764000(24)251 251.079580(5)252 252.081620(5)

99 Es 252 252.082970(50) [252]

100 Fm 257 257.095099(7) [257]

101 Md 256 256.094050(60) [258]258 258.098425(5)

102 No 259 259.10102(11)# [259]

103 Lr 262 262.10969(32)# [262]

104 Rf 261 261.10875(11)# [261]

105 Db 262 262.11415(20)# [262]

106 Sg 266 266.12193(31)# [266]

107 Bh 264 264.12473(30)# [264]

108 Hs 277 [277]


109 Mt 268 268.13882(34)# [268]

110 Uun 281 [281]

111 Uuu 272 272.15348(36)# [272]

112 Uub 285 [285]

114 Uuq 289 [289]

116 Uuh 292 [292]


Useful Physical Constants

values from:Fundamental Physical Constants from NISThttp://physics.nist.gov/cuu/Constants/index.html

constant symbol value units equivalent units

atomic mass constant (amu) 1.66054E-27 kgAvogadoro's number N 6.02214E+23Boltzmann constant k 1.38065E-23electron mass 9.10938E-31 kgelementary charge e 1.60218E-19 C

Faraday constant F 9.64853E+04molar gas constant R 8.31447E+00 equivalent form: R 8.20575E-02Planck constant h 6.62607E-34 J sspeed of light in vacuum c 2.99792E+08

mu

mol-1

J K-1

me

C mol-1 J mol-1 V-1

J mol-1 K-1

L atm mol-1 K-1

m s-1

formula wt calculator

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