What is the rate and order of a reaction of the mechanism is
$2 NO + H_{2} \to N_{2} + H_{2} O_{2} (slow)$

Following by $H_{2} O_{2} + H_{2} \to 2 H_{2} O$ (fast)

The rate of reaction depend on the slowest step thus

R a t e = k {[NO]}^{2} [H_{2}]

Order of reaction is 2+1 =3

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Chemical Kinetics

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