What is the difference between the order of a reaction and its molecularity?

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Solution

Order of a reaction Molecularity of a reaction
It is the number of molecules whose concentration (changes) determines the rate of the reaction.
It is the number of reactant species which collide simultaneously in a step leading to chemical reaction.
It is the sum of the powers of the concentration of reactants in the rate equation (rate law). It is an experimentally determined quantity.
It is the total number of molecules present in the reactant(s) of a balanced chemical equation.

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What are the differences between order of reaction and molecularity of reaction?

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Order of a reaction	Molecularity of a reaction
It is the number of molecules whose concentration (changes) determines the rate of the reaction.	It is the number of reactant species which collide simultaneously in a step leading to chemical reaction.
It is the sum of the powers of the concentration of reactants in the rate equation (rate law). It is an experimentally determined quantity.	It is the total number of molecules present in the reactant(s) of a balanced chemical equation.