Chemical Kinetics Worksheet With Answers By Prof. Abdullah M. Asiri - 2009 Page 11
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33August 16, 2009
[PROBLEM SET FROM R. CHANG TEST
BANK]
CHO → CH
37. The thermal decomposition of acetaldehyde, CH
+ CO, is a second-order reaction. The
3
4
following data were obtained at 518°C.
Calculate the rate constant for the decomposition of acetaldehyde from the above data.
2.2 × 10
-3
A.
/s
B.
0.70 mmHg/s
2.2 × 10
-3
C.
/mmHg·s
6.7 × 10
-6
D.
/mmHg·s
5.2 × 10
-5
E.
/mmHg·s
CHO → CH
38. The thermal decomposition of acetaldehyde, CH
+ CO, is a second-order reaction. The
3
4
following data were obtained at 518°C.
Based on the data given, what is the half-life for the disappearance of acetaldehyde?
1.5 × 10
5
A.
s
B.
410 s
5.4 × 10
7
C.
s
D.
520 s
E.
305 s
39. For the chemical reaction A → B + C, a plot of [A]
versus time is found to give a straight line with a
t
negative slope. What is the order of reaction with respect to A?
A.
zeroth
B.
first
C.
second
D.
third
E.
Such a plot cannot reveal the order of the reaction.
11
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