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Question

For the reaction, 2NO+2H2N2+2H2O, the following kinetic data were obtained:
Expt.
No.
[H2]
(molL1)
[NO]
(molL1)
Rate of reaction
(molL1s1)
1.0.120.120.25×104
2.0.120.241.0×104
3.0.240.242.0×104
Determine the rate law and the rate constant.

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Solution

Rate =K[A]m[B]n
=K[H2]m[NO]n
(0.120.12)m(0.120.24)n=0.25×1041.0×104
(0.5)n=0.25
n=2
(01.120.24)m(0.240.24)n=1×1042×104
(0.5)m=(0.5)
m=1
Rate =K[H2][NO]2
K=0.25×104[0.12][0.12]2
K=0.0144mol2l+2S1

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