Chemistry 111
Page 1 out of 7
Exam III /Fall 2003
Answer Key
Instructions
.
Failure to show work will result in zero points being awarded in any question,
unless it actually requires no work.
If a blank is provided for an answer, you must enter your
answer in that blank.
1. If the reaction:
A
→
Products…
follows second order kinetics, then a plot of [A] versus
time would be linear.
True or
false
?
Circle your answer.
(02 pts)
2.
Going back to the first question, a plot of ln[A] versus time would be linear.
True or
false
?
Circle your answer.
(03 pts)
3.
If the time is measured in minutes, what would be the units of k in the first question?
Write
your answer in the blank.
(03 pts)
L mol
-1
min
-1
or
atm
-1
min
-1
4.
Which of the following would have the largest value for
b
in the Vander Waals equation of
state?
(03 pts)
CH
3
CH
2
CH
3
CH
3
C(CH
3
)
2
CH
3
CH
3
CH
3
CH
4
For questions
5-8
, consider three identical tanks kept under the exact conditions of temperature
and pressure.
One contains SO
2
(MW = 64), another contains O
2
(MW = 32) and the last one
has CH
4
(MW = 16).
5.
Which of these gases would have the highest average kinetic energy?
(03 pts)
They are all at the same temperature, therefore they all have the
same
average kinetic
energy.
Remember that the average kinetic energy is given by…
KE
=
3
2
R T
6.
Which of these gases would have the fastest root mean square velocity?
(03 pts)
Now that is a different question.
They have the same energy, but since they have
different molecular weights, they have different average velocities.
From the equation…
v
rms
=
3 R T
MW

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