huynh (hph268) – Homework 3 – Sutcliffe – (51060)
1
This
printout
should
have
17
questions.
Multiplechoice questions may continue on
the next column or page – find all choices
before answering.
This is the remainder of the material for
Exam 1.
001
10.0 points
Find
the
normal
boiling
point
of
4
m
CaCl
2
(aq), assuming it undergoes complete
dissociation.
The boiling point constant of
water is 0
.
51 K
·
kg
/
mol.
Answer in units of
◦
C. Your answer must
be within
±
0.3%
002
10.0 points
Glycerol (a nonelectrolyte that can be used
as antifreeze in a car radiator) has a density
of 1.261 g/mL and a molecular weight of 92
g.
If 100 mL are mixed with 1 kg of water,
what is a good estimate of the temperature
at which this solution will freeze? (
K
f water
=
1
.
861
◦
C/
m
.)
1.
0.0
◦
C
2.
−
12
.
4
◦
C
3.
−
4
.
8
◦
C
4.
−
0
.
23
◦
C
5.
−
2
.
6
◦
C
003
10.0 points
Polyacrylamide is a watersoluble polymer
whose aqueous solution containing 25 g/L de
velops an osmotic pressure of 0.54 torr at
25
◦
C. Find the approximate molecular weight
of the polymer sample.
1.
35,000 g/mol
2.
1133 g/mol
3.
8,600,000 g/mol
4.
860,000 g/mol
5.
350,000 g/mol
004
10.0 points
Consider the solutions
Z1) 0.5 M Na
2
SO
4
Z2) 0.6 M NaCl
Z3) 1.0 M sugar
What answer gives the expected order of
increasing osmotic pressure?
1.
lowest Z2
<
Z1
<
Z3 highest
2.
lowest Z3
<
Z1
<
Z2 highest
3.
lowest Z2
<
Z3
<
Z1 highest
4.
lowest Z3
<
Z2
<
Z1 highest
5.
lowest Z1
<
Z2
<
Z3 highest
005
10.0 points
Two aqueous solutions are separated by a
semipermeable membrane.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '08
 wandelt
 Chemistry, Equilibrium, pH, Reaction, Kc, Huynh

Click to edit the document details