Mole Calculations Review Sheet
Molar Mass:
1. Calculate the molar mass for each of the following compounds.
A) NaBr
102.894 g/mol
F) H2O
18.015 g/mol
B) MgCl2
95.211 g/mol
G) AlPO4
121.952 g/mol
C) H2SO4
98.078 g/mol
H) Ca(OH)2
74.094 g/mol
D) Al2(SO4)3
342.15 g/mol
I) MgSO4
120.367 g/mol
E) FeCl3
162.206 g/mol
J) (NH4)2SO3 116.141 g/ mol
Mole Calculations:
2. What are the three conversion factors including the mole?
1 mole = 6.02 x 1023 particles
1 mole = 22.4 Liters
1 mole = ??? grams
3. Convert the following: 4.5 moles Al = ____________________ atoms Al
4.5 moles x 6.02 x 1023 atoms = 2.71 x 1024 atoms
1 mole
4. Mole concept, Circle true or false for the following statements. If the state is false,
explain why!
a. T
or
F
1 mole of Boron has the same mass as 1 mole of Carbon
The molar mass for Boron is 10.81 g/mol & Carbon is 12.011 g/mol
b. T
or
F
1 mole of Boron has the same number of atoms as 1 mole Carbon
c. T
or
F
1 mole of Hydrogen occupies the same space as 1 mole Fluorine
(at STP, the volume occupied 1 mole is 22.4 L)
d. T
or F
The number of particles in 1 mole is different for each element
The number of particles in one mole is always 6.02 x 1023 particles
e. T
or F
35.453 g of Chlorine is equal to 1 mole of Chlorine
5. How many moles of CO2 are in 6.32 Liters of CO2?
6.32 Liters x 1 mole = 0.282 moles
22.4 Liters
6. How many Liters are in 5.38 x 1024 molecules of O2?
5.38 x 1024 molecules
x
1 mole
x
6.02 x 1023 molecules
22.4 L
=
200. Liters
1 mole
7. Convert the following: 3.2g Na = __________________ atoms Na
3.2 grams x 1 mole x 6.02 x 1023 atoms = 8.38 x 1022 atoms
22.990 g
1 mole
8. What is the mass of 6.43 x 1025 molecules of CCl4?
6.43 x 1025 molecules x
1 mole
x 153.823 g = 16,400 g
6.02 x 1023 molecules
1 mole
9. How many grams are in 3.14 x 1023 molecules of Cl2?
3.14 x 1023 molecules x
1 mole
x
6.02 x 1023 molecules
70.906 g = 37.0 g
1 mole
10. Convert the following: 62.8g Mg(NO3)2 = ________________ moles Mg(NO3)2
62.8 g x 1 mole = 0.423 moles
148.313 g