Chemical Kinetics Worksheet With Answers By Prof. Abdullah M. Asiri - 2009 Page 27
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33August 16, 2009
[PROBLEM SET FROM R. CHANG TEST
BANK]
→ 2N
92. For the first-order reaction 2N
O
O
+ O
at a particular temperature, the half-life of N
O
is 0.90
2
5
2
4
2
2
5
hr. What fraction of the initial concentration of N
O
will remain after 2.4 hours?
2
5
at 500°C is 9.2 × 10
-3
-1
93. The rate constant for the first-order decomposition of C
H
s
. How long will it take
4
8
for 10.0% of a 0.100 M sample of C
H
to decompose at 500°C?
4
8
94. The activation energy for a certain reaction is 113 kJ/mol. By what factor (how many times) will the rate
constant increase when the temperature is raised from 310 K to 325 K?
95. Nitric acid is formed by the gas-phase hydrolysis of N
O
. Draw an energy profile curve for the reaction
2
5
O → 2HNO
N
O
+ H
given that E
(forward) = 15 kJ and E
(reverse) = 51 kJ/mol. Label the activation
2
5
2
3
a
a
energies of the forward and reverse reactions and label ∆H for the reaction.
O → 2HNO
96. Nitric acid is formed by the gas-phase hydrolysis of N
O
. For the reaction N
O
+ H
,
2
5
2
5
2
3
(reverse) = 51 kJ/mol. Calculate ∆H
E
(forward) = 15 kJ/mol and E
.
a
a
rxn
27
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