## writing elementary steps

$K = \frac{k_{forward}}{k_{reverse}}$

inlovewithchemistry
Posts: 104
Joined: Fri Sep 28, 2018 12:19 am

### writing elementary steps

the rate law of the reaction 2NO + 2H2 --> N2 + 2H2O is rate= k[NO]^2[H2]
these are the written steps:
step 1: NO + NO--> N2O2
step 2: N2O2 + H2 --> N2O + H2O
step 3: N2O + H2 --> N2 + H2O

why is the NO in the rate law squared but not the H2 when there are 2 of both molecules in the chemical equation?

also, do we consider N2O2 and NO^2 to be the same thing? (maybe a stupid question)

Mukil_Pari_2I
Posts: 87
Joined: Fri Sep 28, 2018 12:29 am

### Re: writing elementary steps

For your second question, the [NO]^2 has to do with the concentration being squared not the formula so it would not be equivalent to N2O2.