Chemical Kinetics Worksheet With Answers By Prof. Abdullah M. Asiri - 2009 Page 15
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33August 16, 2009
[PROBLEM SET FROM R. CHANG TEST
BANK]
NC → CH
53. The isomerization of methyl isocyanide, CH
CN, follows first-order kinetics. The half-lives
3
3
were found to be 161 min at 199°C and 12.5 min at 230°C. Calculate the activation energy for this
reaction.
6.17 × 10
-3
A.
kJ/mol
B.
31.4 kJ/mol
C.
78.2 kJ/mol
D.
124 kJ/mol
E.
163 kJ/mol
54. Calculate the activation energy, in kJ/mol, for the redox reaction
→ Sn
2+
3+
4+
2+
Sn
+ 2Co
+ 2Co
.
A.
59.2
B.
0.477
C.
5.37
D.
163 kJ
E.
48.1 kJ
→ C
55. The reaction C
H
H
+ C
H
has an activation energy (E
) of 350 kJ/mol, and the E
of the reverse
4
10
2
6
2
4
a
a
reaction is 260 kJ/mol. Estimate ∆H, in kJ/mol, for the reaction as written above.
A.
-90 kJ/mol
B.
+90 kJ/mol
C.
350 kJ/mol
D.
-610 kJ/mol
E.
+610 kJ/mol
56. The activation energy for the following first-order reaction is 102 kJ/mol.
(g) → 2NO
N
O
(g) + (1/2)O
(g)
2
5
2
2
The value of the rate constant (k) is 1.35 × 10
-4
-1
s
at 35°C. What is the value of k at 0°C?
8.2 × 10
-7
-1
A.
s
1.9 × 10
-5
-1
B.
s
4.2 × 10
-5
-1
C.
s
2.2 × 10
-2
-1
D.
s
E.
none of these
15
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