Mole Quantities Review Sheet
Chemistry I PreAP
1.
Name_____________________
Date______________Pd______
Determine the molar mass of each of the following:
a) silver sulfate
b) acetic acid
c) hydrogen peroxide
2.
Which of the compounds above has the highest percentage of oxygen? Show work for each.
a)
3.
b)
c)
a) Convert 235 g calcium carbonate to moles.
b) Convert 0.1250 g C8H10N4O2 to the number of carbon atoms.
c) How many molecules are in 1.07 moles C2H4?
d) Convert 25.2 g Cu3(AsO3)2 to Cu2+ ions and AsO33- ions.
4.
Determine which of the following contains the greatest mass of aluminum. Show all work.
a) 27 g of aluminum
b) 122 g AlPO4
c) 266 g Al2Cl6
d) 225 g Al2S3
5.
Determine the empirical formula for Lucite that contains 71.40% C, 9.59% H, and 19.02 % O.
6. Determine the empirical formula and the molecular formula for dichloroethane that has the
following percentages: 24.3% C, 71.6% Cl and 4.1% H and has a molecular mass of 99 g/mole.
7.
Find the formula for the hydrate, Mg(ClO4)2 ∙ X H2O using the following data:
mass of crucible
mass of crucible and contents
mass of crucible and contents after heating
32.861g
41.361g
38.587g
8. A compound that contains only nitrogen and oxygen is 30.4% N by mass. The molar mass of the
compound is 92 g/mol. What is the empirical formula and molecular formula for the compound?
9. A solid silver cylinder with a radius of 7.35 cm and a height of 12.6 cm has a density of 10.5 g/cm3.
What is the mass of the cylinder in pounds and how many silver atoms are present?
10. Name the following hydrates:
a) NiSO4 ∙ 6 H2O
b) La(NO3)3 · 6 H2O
c) CoCl2 ·2 H2O
Write the formula for the following hydrates:
d) magnesium chloride hexahydrate
e) magnesium sulfate heptahydrate
f) manganous sulfate monohydrate
Answers
1.a) 311.80 g/mol
b) 60.05 g/mol
c) 34.01 g/mol
2a) 20.53%
b) 53.29%
c) 94.09%
highest is hydrogen peroxide
3a) 2.35 moles
b) 3.100 x 1021 C atoms
c) 6.44 x 1023 molecules
4a) 27 g
b) 27.0 g
c) 53.8g
d) 80.9g the greatest mass is in Al2S3
5) C5H8O
6) CClH2, C2Cl2H4
7) Mg(ClO4)2 · 6 H2O
8) NO2, N2O4
9) 49.4 lb, 1.25 x 1026 atoms of silver
10a) nickel (II) sulfate hexahydrate
b) lanthanum (III) nitrate hexahydrate
c) cobalt (II) chloride dehydrate
d) MgCl2·6H2O
e) MgSO4·7H2O
f) MnSO4·H2O