Chapter 11:
The Mole
Practice Test
1.
How many particles are present in one mole of particles?
a.
3.0 × 10
8
b.
12
c.
1
d.
6.02 × 10
23
Hint
2.
A compound contains sulfur, oxygen, and chlorine. Analysis of a sample showed that it contained by mass 26.95% sulfur and 59.61% chlorine. What is the simplest formula for this compound?
a.
SO
2
Cl
b.
SOCl
c.
SOCl
2
.
d.
SO
2
Cl
2
.
Hint
3.
A compound that has a specific number of water molecules bound to the structure is ______________?
a.
a hydrate
b.
waterlogged
c.
aqueous
d.
an anhydrate
Hint
4.
How many molecules of ammonia are present in 34.0 g of ammonia NH
(3)
?
a.
6.02 × 10
23
b.
34
c.
1.77 × 10
22
d.
1.20 × 10
24
Hint
5.
How is one gram defined?
a.
10 moles of amu
b.
one mole of amu
c.
0.1 mole of amu
d.
one mole of protons
Hint
6.
How many moles of C
3
H
8
are present in 451 g C
3
H
8
?
a.
1.44 mol
b.
10.2 mol
c.
3.84 mol
d.
0.879 mol
Hint
7.
What is the molar mass of H
2
CrO
4
?
a.
52 g
b.
64 g
c.
2 g
d.
118 g
Hint
8.
What is the mass of 5.0 × 10
21
molecules of water?
a.
0.15 g
b.
6.02 x 10
23
g
c.
5.0 g
d.
8.3 x 10
-3
g
Hint
9.
How many moles of atoms are present in one mole of water?
a.
1 mol
b.
3 mol
c.
2 mol
d.
6 mol
Hint
10.
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.
Fe
3
O
4
b.
FeO
2
c.
FeO
d.
Fe
2
O
3
Hint
11.
How many moles of hydrogen are present in 2.0 grams of hydrogen gas?
a.
2.0 mol
b.
4.0 mol
c.
1.0 mol
d.
0.5 mol
Hint
12.
What mass of iron is contained in 62.8 grams of pyrite FeS
(2)
?
a.
58.5 g
b.
40.3 g
c.
29.2 g
d.
31.7 g
Hint
13.
What is the mass of 1.0 × 10
12
molecules of O
2
?
a.
2.7 × 10
-11
g
b.
6.0 × 10
11
g
c.
5.3 × 10
-11
g
d.
1.9 × 10
13
g
Hint
14.
How can the actual molecular formula be determined?
a.
from the molar mass multiplied by the mass of the empirical formula
b.
from the empirical formula alone
c.
from the molar mass alone
d.
from the molar mass divided by the mass of the empirical formula
Hint
15.
An empirical formula mass is found to be 17 g/mol. The molar mass is found to be 34 g/mol. What is the number of empirical formula units in this molar mass?
a.
0.5 unit
b.
17 units
c.
2 units
d.
1 unit
Hint
16.
What is the mass of one mole of carbon-12 atoms?
a.
12 grams
b.
12 amu
c.
6 amu
d.
6 grams
Hint
17.
What is the percent composition of carbon dioxide CO
(2)
?
a.
27% C and 73% O
b.
33% C and 66% O
c.
50% C and 50% O
d.
73% C and 27% O
Hint
18.
Calculate the number of atoms in 4.00 × 10
-5
g sodium.
a.
1.05 × 10
18
atoms
b.
5.54 × 10
20
atoms
c.
3.24 × 10
23
atoms
d.
3.92 × 10
19
atoms
Hint
19.
Which word indicates that two water molecules are associated with a substance in a chemical compound?
a.
tri-
b.
mono-
c.
di-
Hint
20.
What is the SI base unit used to measure the amount of a substance?
a.
kilogram
b.
kelvin
c.
mole
d.
meter
Hint
