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Chemistry 162
Exam I
February 20, 2008
Student Name (Print): __Tavss__________________
Recitation Section Number:
t
Recitation Instructor:
____Tavss______________
The exam booklet has 25 questions for credit and one additional question to check the color of your
exam booklet.
Please answer all 26 questions
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ON THE OpScan FORM (Use a #2 pencil or darker)
Sec
Per.
Instr
Sec
Per.
Instr
1.
SIGN your name across the top of the form.
01
M3
RA
30
Th3
NM
2.
Code the following information (
blacken
circles)
03
M5
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31
Th3
ET
Your Name (LAST
NAME FIRST)
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Your SOCIAL SECURITY NUMBER
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YS
34
M6
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[Start under Box
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and continue to Box
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Your RECITATION SECTION NUMBER in
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0S
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AM
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Your EXAM FORM NUMBER
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17
M1
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YS = Y. Shin, RA = R. Agarwal, AM = A. McGhan
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SM = S. Marvasti, SZ = S. Zbaida, NM = N. Marky
20
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MR = M. Rabeony, ET = E. Tavss
23
W1
ET
Periods: 1 = 9:3010:25, 3 = 12:151:10 or 12:501:45
25
W3
ET
5 = 3:354:30, 6 = 5:156:10, 8 = 8:25p9:20p
26
W3
MR
Your EXAM FORM is
C162s08e1v1
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1
CHEM 1622008 EXAM I
CHAPTER 12  PROPERTIES OF SOLUTIONS
COLLIGATIVE PROPERTIES (BOILING POINT, FREEZING POINT, OSMOTIC
PRESSURE CHANGES) CALCULATIONS
What is the boiling point of a solution of CHCl
3
in C
6
H
6
that freezes at 5.22 °C?
Data for C
6
H
6
:
K
f
= 5.12 °C/m, K
b
= 2.53 °C/m T
f
=
5.53 °C, T
b
= 80.10 °C
A.
79.95 °C
B.
80.15 °C
C.
82.68 °C
D
.
80.25 °C
E.
77.52 °C
Boilingpoint elevation: ΔT = T
f
 T
i
= K
b
im
solute
Freezingpoint depression: ΔT = T
f
 T
i
= K
f
im
solute
Plan: You’re not given enough information to find the T
final
for the
boiling point, because you don’t know the molality of the solute.
But
you have enough information to find the molality of the solute in the
freezing point depression formula.
Therefore, find the molality of the
solute using the freezing point formula, then use that value of the
molality in the boiling point formula to find the boiling point.
T
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This note was uploaded on 09/23/2009 for the course CHEM 162 taught by Professor Siegal during the Spring '08 term at Rutgers.
 Spring '08
 siegal

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