Chemical Kinetics Worksheet With Answers By Prof. Abdullah M. Asiri - 2009 Page 9
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33August 16, 2009
[PROBLEM SET FROM R. CHANG TEST
BANK]
29. A first-order reaction has a rate constant of 7.5 × 10
-3
/s. The time required for the reaction to be 60%
complete is
3.8 × 10
-3
A.
s.
6.9 × 10
-3
B.
s.
C.
68 s.
D.
120 s.
E.
130 s.
→ SO
30. The first-order reaction SO
Cl
+ Cl
is 10% complete in 80. min. How long would it take for the
2
2
2
2
reaction to be 95% complete?
A.
1.8 min
B.
104 min
C.
530 min
D.
2300 min
E.
990 min
31. Benzoyl chloride, C
H
COCl, reacts with water to form benzoic acid, C
H
COOH, and hydrochloric acid.
6
5
6
5
This first-order reaction is 25% complete after 26 s. How much longer would one have to wait in order to
obtain 99% conversion of benzoyl chloride to benzoic acid?
A.
390 s
B.
420 s
C.
180 s
D.
290 s
E.
210 s
32. A certain reaction A → products is second order in A. If this reaction is 10.% complete after 20. s, how
long would it take for the reaction to be 90.% complete?
A.
180 s
B.
1600 s
C.
440 s
D.
18,000 s
E.
540 s
33. A certain reaction A → products is second order in A. If this reaction is 85% complete in 12 minutes, how
long would it take for the reaction to be 15% complete?
A.
110 s
B.
27 s
C.
62 s
D.
130 s
E.
22 s
9
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