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Apply steady-state approximation

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Consider the following mechanism for the reaction of nitric oxide with hydrogen:

1) 2NO ----> N2O2
<----

2) N2O2 + H2 -----> N2 + H2O2

3) H2O2 + H2 ----> 2 H2O

a) apply the steady state approximation to one or more of the intermediates and thence derive the rate law for the overall reaction.

B) under what conditions does the rate law reduce to third order?

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The expert applies steady-state approximation.

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1) 2NO ----> N2O2
<----
rate = -1/2 d[NO]/dt = d[N2O2]/dt

2) N2O2 + H2 -----> N2 + H2O2
rate = ...

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