Section 11.2
Mass and the Mole
Practice Test
1.
How many moles of chlorine are in 100 g chlorine (Cl)?
Element
Molar Mass (g/mol)
Hydrogen
1.01
Carbon
12.01
Chlorine
35.45
a.
0.355
b.
2.82
c.
64.6
d.
100
Hint
2.
How many atoms of carbon are in a pure sample of carbon having a mass of 72.0 g?
Element
Molar Mass (g/mol)
Hydrogen
1.01
Carbon
12.01
Chlorine
35.45
a.
3.6 x 10
24
b.
36 x 10
24
c.
3.6 x 10
23
d.
4.33 x 10
25
Hint
3.
What is the mass of one mole of carbon-12 atoms?
a.
12 amu
b.
12 grams
c.
6 amu
d.
6 grams
Hint
4.
How many moles of hydrogen are present in 2.0 grams of hydrogen gas?
a.
2.0 mol
b.
0.5 mol
c.
1.0 mol
d.
4.0 mol
Hint
5.
What is the mass of 5.0 x 10
21
molecules of water?
a.
8.3 x 10
-3
g
b.
0.15 g
c.
5.0 g
d.
6.02 x 10
23
g
Hint
6.
How many moles of atoms are present in one mole of water?
a.
3 mol
b.
6 mol
c.
1 mol
d.
2 mol
Hint
7.
How many moles of hydrogen atoms are present in 2.0 moles of ammonia NH(
3
)?
a.
3.0 mol
b.
6.0 mol
c.
8.0 mol
d.
2.0 mol
Hint
8.
What is the molar mass of H
2
CrO
4
?
a.
118 g
b.
52 g
c.
64 g
d.
2 g
Hint
9.
How many molecules of ammonia are present in 34.0 g of ammonia NH(
3
)?
a.
1.20 x 10
24
b.
6.02 x 10
23
c.
1.77 x 10
22
d.
34
Hint
10.
How is one gram defined?
a.
one mole of amu
b.
one mole of protons
c.
10 moles of amu
d.
0.1 mole of amu
Hint
11.
A sample of a compound is found to contain 0.404 grams of Fe and 0.174 grams of O. What is the empirical formula for this compound?
a.
FeO
b.
FeO
2
c.
Fe
2
O
3
d.
Fe
3
O
4
Hint
12.
What is the mass of 1.0 x 10
12
molecules of O
2
?
a.
1.9 x 10
13
g
b.
6.0 x 10
11
g
c.
2.7 x 10
-11
g
d.
5.3 x 10
-11
g
Hint
13.
How many moles of C
3
H
8
are present in 451 g C
3
H
8
?
a.
3.84 mol
b.
0.879 mol
c.
10.2 mol
d.
1.44 mol
Hint
14.
Calculate the number of atoms in 4.00 x 10
-5
g sodium.
a.
1.05 x 10
18
atoms
b.
3.92 x 10
19
atoms
c.
3.24 x 10
23
atoms
d.
5.54 x 10
20
atoms
Hint
