2NO[g]+2H2[g]-----> N2[g]+2H2O[g]

The rate law for the reaction is 1st order with respect to H2 and 2nd order with respect to NO.Write the rate law for this reaction.[Kindly plz explain how?]

We are given that the order of reaction is first order with respect with respect to H2 and second order with respect to NO. So the rate law is as follows 

 -d / dt = k [H2][NO]2

where k is the rate constant for the reaction. 

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