rate equation and overall equationWatch
Rate equation or rate law is the expression indicating the relationship between rate of reaction and concentration of reactants. It will be something like Rate = k[H2]^2[O2]But overall equation is the chemical equation representing the reaction. It will be something like2H2 O2 --> 2H2OBoth will be different
The rate equation you gave shows 2 molecules of H2 reacting with one molecule of O2 - this matches the overall equation's stoichiometry. This will imply that the entire reaction is the rate determining step.
have a look at question 5c in this pack of exam qs
5c) How can you tell that H+ acts as a catalyst in this reaction?
the answer is
"Appears in rate equation (1)
does not appear in (stoichiometric / overall) equation (1) "
hope this helps