Write two differences between 'order of reaction' and 'molecularity of reaction'.

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Solution

Order Molecularity
It is the sum of the exponents to which the concentration terms in the rate law are raised.
It is the number of reactant molecules taking part in an elementary reaction
It is purely an experimental property indicating the dependence of observed reaction rate on the concentration of reactants.
It is theoretical property indicating the number of reactant molecules involved in each act leading to the reaction.

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

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Order	Molecularity
It is the sum of the exponents to which the concentration terms in the rate law are raised.	It is the number of reactant molecules taking part in an elementary reaction
It is purely an experimental property indicating the dependence of observed reaction rate on the concentration of reactants.	It is theoretical property indicating the number of reactant molecules involved in each act leading to the reaction.