Chemical Kinetics Worksheet With Answers By Prof. Abdullah M. Asiri - 2009 Page 8
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33August 16, 2009
[PROBLEM SET FROM R. CHANG TEST
BANK]
26. The isomerization of cyclopropane to form propene
is a first-order reaction. At 760 K, 85% of a sample of cyclopropane changes to propene in 79.0 min.
Determine the rate constant for this reaction at 760 K.
3.66 × 10
-2
-1
A.
min
1.04 × 10
-2
-1
B.
min
-1
C.
2.42 min
2.06 × 10
-3
-1
D.
min
2.40 × 10
-2
-1
E.
min
27. The isomerization of cyclopropane to propene follows first-order kinetics. At 700 K, the rate constant for
this reaction is 6.2 × 10
-4
-1
min
. How many minutes are required for 10.0% of a sample of cyclopropane to
isomerize to propene?
A.
16,100 min
B.
170 min
C.
3,710 min
1.43 × 10
-3
D.
min
E.
1,120 min
28. At 700 K, the rate constant for the following reaction is 6.2 × 10
-4
-1
min
. How many minutes are required
for 20% of a sample of cyclopropane to isomerize to propene?
(cyclopropane) → C
C
H
H
(propene)
3
6
3
6
A.
1,120 min
B.
360 min
C.
3710 min
1.4 × 10
-4
D.
min
E.
280 min
8
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