Section 11.2
Mass and the Mole
Practice Test
1.
How many moles of atoms are present in one mole of water?
a.
6 mol
b.
3 mol
c.
2 mol
d.
1 mol
Hint
2.
Calculate the number of atoms in 4.00 x 10
-5
g sodium.
a.
3.24 x 10
23
atoms
b.
3.92 x 10
19
atoms
c.
1.05 x 10
18
atoms
d.
5.54 x 10
20
atoms
Hint
3.
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
4.
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.
64.6
b.
100
c.
0.355
d.
2.82
Hint
5.
What is the mass of 1.0 x 10
12
molecules of O
2
?
a.
6.0 x 10
11
g
b.
1.9 x 10
13
g
c.
2.7 x 10
-11
g
d.
5.3 x 10
-11
g
Hint
6.
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.
34
d.
1.77 x 10
22
Hint
7.
What is the mass of 5.0 x 10
21
molecules of water?
a.
8.3 x 10
-3
g
b.
5.0 g
c.
6.02 x 10
23
g
d.
0.15 g
Hint
8.
How is one gram defined?
a.
one mole of protons
b.
one mole of amu
c.
10 moles of amu
d.
0.1 mole of amu
Hint
9.
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.
36 x 10
24
b.
3.6 x 10
24
c.
3.6 x 10
23
d.
4.33 x 10
25
Hint
10.
How many moles of hydrogen atoms are present in 2.0 moles of ammonia NH
3
?
SC.A.2.4.2
a.
6.0 mol
b.
8.0 mol
c.
3.0 mol
d.
2.0 mol
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?
SC.A.2.4.2
a.
FeO
2
b.
FeO
c.
Fe
3
O
4
d.
Fe
2
O
3
Hint
12.
What is the mass of one mole of carbon-12 atoms?
a.
12 grams
b.
6 amu
c.
6 grams
d.
12 amu
Hint
13.
What is the molar mass of H
2
CrO
4
?
SC.A.2.4.2
a.
52 g
b.
64 g
c.
118 g
d.
2 g
Hint
14.
How many moles of hydrogen are present in 2.0 grams of hydrogen gas?
a.
0.5 mol
b.
1.0 mol
c.
2.0 mol
d.
4.0 mol
Hint
