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Molecularity is the number of molecules that are in the rate determining step. Which is different from the order of reactants which is the sum of the powers to which the reactant concentrations are raised in the rate law.
Molecularity is the number of species in an elementary step. The rate law for each elementary step follows directly from molecularity. For example somehting is bimolecular if the elementary step involves two reactants. A+B ---> P , rate=k[A][B]
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