mole
TRANSCRIPT
MATTER AROUND USCHEMICAL FORMULAE AND
EQUATIONS
Mole Particle 15 6.02 x 10233.01 x 1024
÷ NA
X NA
4.816 x 10249
Particles MOLECULE
ION
ATOMNumber of mole atom
Number of mole molecule
Number of mole ion
CC
Example Count number of atom in 0.4 mole atom carbon.C
Solution:
0.4 mole ? Atom carbon
Number of mole atom carbon = 0.4 mole
Get the information from question
So, number of atom carbon is,
= 0.4 x Avogadro constant
= 0.4 x 6.02 x 1023 atom
use the relationship in figure 1
= 2.48 x 1023 atoms
Number of mole molecule
Number of molecule Number of atom
x NA x depending on formulas chemistry
÷ depending on formulas chemistry÷ NA
HO
Relationship for
2 mole molecule H2
2 x NA 2 x NA x 2
Molecule H2 = Atom H =
There are 3 mole gases hydrogen, H2 in one container,
a) Number of molecule hydrogen, H2
b) Number of atom hydrogen
Example
Get the information from the question
3 mole molecule of hydrogen, H2 ? Molecule hydrogen, H2
a) So, number of molecule hydrogen, H2 ;
= 3 x Avogadro Constant
= 3 x 6.02 x 1023 molecule
= ___________ molecule
Use the relationship in
figure 2
Solution :
Number of mole molecule hydrogen, H2 = 3 mole molecule hydrogen, H2
Count;
b) Every molecule hydrogen, H2 consist of 2 atom hydrogen. So, number of atom hydrogen in the gas container;
3 x 6.02 x 1023 molecule hydrogen, H2 ? Atom hydrogen
Use the relationship in
figure 2
= 2 x number of molecule hydrogen, H= 2 x 3 x 6.02 x 1023 atom= ______________ atom
Analysis formulae
molecule H2
There are 3 mole gases in one container,
b) Number of atom hydrogen
H H
Molecule of water H2O
HO
Sample of water consist of 1.806 x 1024 molecules, count;
a) Number of mole water molecule
b) Number of atom oxygen
c) Number of atom hydrogen in the sample.
EXAMPLE
H
Solution;
1.806 x 1024 molecule water
? Molecule water
So, number of mole molecule water;
= 1.806 x 1024 ÷ NA
= 1.806 x 1024
= 3 mole molecule of water
a) Number of molecule water = 1.806 x 1024
Get the information from
question
6.02 x 1023
1.806 x 1024 molecule water
? Molecule water
b) 1 molecule water consist 1 atom oxygen
So, 1.806 x 1024 molecule of water consist of 1.806 x1024 atom of oxygen
OH H
c) Every molecule water, H2O consist of 2 atom hydrogen. So, number of atom hydrogen in the sample;
= 2 x number of molecule hydrogen. H= 2 x 2 x 6.02 x 1023 atom= 4 x 6.02 x 1023 atom= 2.408 x 1024 atom
OHH
Number of mole ion Number of unit Number of ion
x NA
x depending on formulas chemistry
÷ depending on formulas chemistry
÷ NA
Relationship for
Example
Count number of units in 4 mole NaCl.
Solution;
1 mole substance 6.02 x 1023 units
So;
4 mole NaCl = ? units
4 mole NaCl = 4 x 6.02x 1023
= 2.408 x 1024 units NaCl
Count number of ions of Cl- in 4 mole NaCl.
One units of NaCl have 1 ion Cl-
So;
One mole unit of NaCl ? ion Cl-
1 mole units of NaCl = 6.02 x 1023 ions
4 mole units of NaCl = 4 x 6.02 x 1023 ions
= 2.408 x 1024 ions