10. What is the mass of C
12
H
22
O
11
in 60.0 mL of 0.0880
M
solution?
a.
0.181 g
b.
1.81 g
c.
5.02 g
d.
5.28 g
e.
none of the above
11. The freezing point of pure camphor is 178.4 °C, and its molal freezing-point constant,
K
f
is 40.0 °C/
m
. Find the freezing point of a solution containing 3.00 g of a compound of
molar mass 125 g/mol in 45.0 g of camphor.
a. 174.1 °C
b. 157.1 °C
c. 135.2 °C
d. 140.4 °C
e. 11.6 °C
Acids and Bases
1. Calculate the
hydroxide
ion concentration of a solution if its pH is 6.389.
a.
1.00 x 10
-14
mol/L
b.
4.08 x 10
-7
mol/L
c.
9.92 x 10
-7
mol/L
d.
2.45 x 10
-8
mol/L
e.
none of the above
2. Which of the following is a correct description of the natural direction of a Brønsted-
Lowry acid-base reaction?
a.
weaker acid + weaker base
→
stronger acid + stronger base
b.
weaker acid + stronger base
→
stronger acid + weaker base
c.
stronger acid + weaker base
→
weaker acid + stronger base
d.
stronger acid + stronger base
→
weaker acid + weaker base
e.
None of the above statements is always correct.
3. In a 0.100
M
HF solution, the percent dissociation is determined to be 9.5%. Calculate
the
K
a
for HF based on this data.
a.
9.5 x 10
-2
b.
1.0 x 10
-3
c.
3.1 x 10
-3
d.
7.6 x 10
-4
e.
9.5 x 10
-4
