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Molecularity is the number of species in an elementary step. The rate law for each elementary steps follows its molecularly. For instance, the molecularity of a rate =k[A] is unimolecular and for the rate k=[A]^2 or k[A][B] is bimolecular.
Molecularity is how many molecules must collide for product to be formed. It relates to reaction rate because the probability of higher number of molecules all impacting at the same time is lower, and so the reaction rate will naturally be lower.
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