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Chemistry 122;
Prof. Allen
Name___________________________________
28 questions
(each question is worth 6.25 points)
MULTIPLE CHOICE.
Choose the one alternative that best completes the statement or answers the question.
1) A sample of N
2
gas is contaminated with a gas (A) of unknown molecular weight. The partial pressure of each
gas is known to be 200 torr at 25
o
C. The gases are allowed to effuse through a pinhole, and it is found that gas A
escapes at a rate one third that of N
2
. What is the molecular weight of gas A?
(Atomic weight: N = 14.01).
A) 9.33
B) 252
C) 84
D) 28
E) 3.11
2) A gas at a pressure of 325 torr exerts a force of __________ N on an area of 5.5 m
2
.
A) 1.8 x 10
3
B) 59
C) 2.4 x 10
5
D) 2.4
E) 0.018
3) In a Torricelli barometer, a pressure of one atmosphere supports a 760 mm column of mercury.
If the original
tube containing the mercury is replaced with a tube having twice the diameter of the original, what will the
height of the mercury column be at one atmosphere pressure?
A) 380 mm
B) 4.78 x 10
3
mm
C) 1.52 x 10
3
mm
D) 760 mm
E) 121 mm
4) Of the following, __________ is a correct statement of Boyle's law.
A)
P
V
= constant
B)
V
T
= constant
C)
n
P
= constant
D)
V
P
= constant
E)
PV
= constant
5) A sample of a gas (1.50 mol) is contained in a 15.0 L cylinder.
The temperature is increased from 100
e
C to 150
e
C.
The ratio of final pressure to initial pressure [
P
2
P
1
] is __________.
A) 0.667
B) 1.00
C) 1.50
D) 0.882
E) 1.13
6) The pressure exerted by 1.3 mol of gas in a 13 L flask at 22
e
C is __________ kPa.
A) 2.4
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 Winter '07
 Zellmer
 Chemistry

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