lesson 2 molar quantities read pages: 55-57 hw – more mole problems – yuk
TRANSCRIPT
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Lesson 2 Molar Quantities
• Read pages: 55-57• HW – More Mole Problems –
Yuk
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Molar mass answer key
Question 1 Question 3a)Na = 22.99g/mol a) Sr(CN)2 = 139.66g/mol
b)Se = 78.96 g/mol b) NaHCO3 = 84.01 g/mol
c) Pb = 207.2 g/mol c) Al2(SO3)3 = 294.17 g/mol
Question 2a)C2H6 = 30.08 g/mol
b)PCl3 = 137.32 g/mol
c) C3H7OH = 60.11 g/mol
d)N2O5 = 108.02 g/mol
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Moles YukQuestion 1 a)2 mol N; 4 mol H b)1.20 x 1024 N atom; 2.41x1024 H atom c) 0.063 mol N; 0.120 mol H d) 3.8 x 1022 atoms N; 7.5 x 1022 atoms HQuestion 2a)3 mol Ca; 2 mol P; 8 mol Ob)1.81 x 1024 Ca atom; 1.21x1024 P atom;
4.82x1024 O atomc) 0.00967 mol Ca; 0.00645 mol P; .0258 mol Od) 5.82 x 1021 atoms Ca; 3.88 x 1021 atoms P;
1.55x1022O atom
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Moles YukQuestion 3 : calcium phosphate
Question 4a)0.0139 g N2
b) 0.0841 g N2
c) 4.20 x 103 gd) 4.65 x 10-23 g
Question 5a)176.14 g/molb) .003 molc) 2x1021 molecules
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Moles Yuk
Question 6 Question 7a) 2 x 10-22 mol a) 294.34 g/molb) 5.549 mol b) 0.0339 molc) 8 x 10-22 mol c) 458 gd) 8.953 mol d) 1.1 x 1019
moleculese) 2.5 x 10-22 mol e) 4.9 x 1021 N atoms
f) 4.89 x 10-22 g
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Counting Particles
Question 1 Question 38.79 x 1023 atoms a) 5.07 x 1024 atomsQuestion 2 b) 4.06 x 1026 protonsa)0.110 mol Cr c) 6.09 x 1026 neutronsb)6.65 x 1022 atomsd) 0.0498 molesc) 1.59 x 1024 protons
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Molar quantities
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Mole Quantities•1 molecule of CH4
corresponds to:•1 Carbon atom, 4 hydrogen
atoms
•12 molecules of CH4 corresponds to
•12 carbon atoms, 48 H atoms
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Mole quantities• 1 dozen CH4 molecules
corresponds to • 1 dozen C atoms, 4 dozen H atoms• 6.02x 1023 molecules of CH4
correspond to • 6.02x1023 C atoms and
4(6.02X1023) H atoms
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Mole quantities• 1 Mole of CH4 molecules
corresponds to • 1 mole of C atoms and 4 moles
of H atoms
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Molecular Mass•How many moles of
magnesium are 3.01x1023atoms of magnesium?
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Mole to Mass conversion
•How many grams are in 7.20 moles of dinitrogen trioxide?
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Mole to mass conversion
•Find the number of moles in 92.2 grams of iron(III) oxide?
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Volume of a gas• At STP 1 mole of any gas occupies
22.4 liters = molar volume of a gas• 22.4 liters of any gas contains
6.02x1023 representative particles of that gas
• Volume will change with temp. and pressure
• STP = standard temperature and pressure
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MOLE Highway
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MOLE Highway