Midterm I Exam; January 30th, 2006
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
.
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.
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 __________.
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 Winter '07
 Zellmer
 Chemistry, Intermolecular force, Van der Waals force, C D E E C D B D E D D, CH3 Cl

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