Chem 152 PLTL #4
Solutions
1.
What is the mass percent of zinc chloride of a 1.12
m
zinc chloride solution
a.
1.52%
b.
7.55%
c.
13.2%
d.
18.0%
e.
24.6%
2.
What is the mol fraction of potassium bromide in a solution that is 14.3% by mass potassium
bromide?
3.
What is the mass percent FeCl
3
in a solution that is 1.84
m
?
4.
A 1.34 M NiCl
2
solution has a density of 1.12 g/mL.
What is the mass percent of NiCl
2
of the
solution?
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5.
What is the mole fraction of zinc nitrate in a solution that is 1.45 M and has a density of
1.22 g/mL?
a.
0.0269
b.
0.0276
c.
0.0951
d.
0.291
e.
0.378
6.
Hydrobromic acid is commercially available in a 3.40 mass percent solution which has a density
of 1.31 g/mL.
What is the molarity of the commercially available hydrobromic acid?
7.
Considering the particles involved, explain why a solution has each of the following properties
as compared to the pure solvent.
a.
a lower vapor pressure:
b.
a higher boiling point:
c.
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 Spring '10
 MCMILLS
 Mass percent, Freezingpoint depression

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