CP CHEMISTRY
Moles Review
Name: ____________________________
___ period
1.
What is a mole?
2.
What is Avogadro’s number?
3.
What is molar mass?
4.
If you have the mass of a substance equal to the molar mass, how many
particles do you have of that substance?
5.
What is the relationship between moles, particles and molar mass?
6.
Calculate the molar masses for the following. Show all your work and circle
your answers.
a.
F2
b.
KC2H3O2
c.
Sr(NO3)2
d.
CCl4
e.
Na2CO310H2O
CP CHEMISTRY, Moles Review, page 2
7.
Perform the following molar conversions:
a.
5.75 x 1024 atoms of Al = ? moles Al
b.
3.75 x 1024 molecules of CO2 = ? moles CO2
c.
2.90 moles Cu = ? atoms Cu
d.
0.85 moles Si = ? g Si
e.
125 g NaOH = ? moles NaOH
f.
25.5 g Ag = ? moles Ag
g.
0.30 g Pb = ? atoms Pb
h.
175 g H2SO4 = ? molecules H2SO4
i.
6.02 x 1024 atoms Bi = ? g Bi
CP CHEMISTRY, Moles Review, page 3
j.
3.40 x 1023 molecules NO2 = ? molecules NO2
8.
What is percent composition?
9.
What is the percent composition of the elements in CaCl2?
10.
What is the percent of oxygen in phosphoric acid, H3PO4?
11.
What is an empirical formula?
12.
What is the empirical formula for MSG (monosodium glutamate) if it contains
35.5% C, 4.77% H, 8.29% N, 37.9% O, and 13.6% Na?
13.
What is the empirical formula of a compound that contains 10.53 g Ni,
4.38 g C, and 5.10 g N?
CP CHEMISTRY, Moles Review, page 4
14.
15.
What is the empirical formula for vanadium oxide if it contains 56.0%
vanadium and 44.0% oxygen?
What is a molecular formula?
16.
What is the molecular formula of a lead compound which contains 59.37%
lead and 40.63% chlorine, if the molar mass of the compound is determined
to be 349.0 g/mol?
17.
Glycerol is a thick liquid containing 39.12% carbon, 8.75% hydrogen, and
52.12% oxygen. Its molar mass is 92.09 g/mol. What is its molecular
formula?
CP CHEMISTRY, Moles Review, page 5
18.
What is a hydrate?
19.
A mass of hydrated calcium sulfate is 4.89 g. It is heated and the water
driven off leaving 3.87 g of anhydrous calcium sulfate. What is the formula
of the hydrated?
20.
A 1.628 g of hydrated magnesium iodide is heated until its mass is reduced
to 1.072 g and all water has been removed. What is the formula of the
hydrate?