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

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Solution

Order Molecularity
It represents the sum of the exponents to which the concentration terms in the rate equation are raised.
It represents the number of reactant molecules that participate in elementary reaction.
It is an experimentally determined quantity.
It is theoretical property.
It can be zero, fraction or integer.
It cannot be zero or fraction. It is an integer.
Experimental conditions may change order.
Experimental conditions cannot change molecularity.
It is property of elementary as well as complex reactions.
It is property of elementary reactions only. It makes no sense for complex reactions.

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

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Order	Molecularity
It represents the sum of the exponents to which the concentration terms in the rate equation are raised.	It represents the number of reactant molecules that participate in elementary reaction.
It is an experimentally determined quantity.	It is theoretical property.
It can be zero, fraction or integer.	It cannot be zero or fraction. It is an integer.
Experimental conditions may change order.	Experimental conditions cannot change molecularity.
It is property of elementary as well as complex reactions.	It is property of elementary reactions only. It makes no sense for complex reactions.