Question

what the difference between order of reaction and molecularity

Answer 1

Order of reaction is the sum of the exponents to which the concentration terms of the reactants are raised.Molecularity is defined as no. of molecules taking part in the reaction. 

Answer 2

ORDER AND MOLECULARITY

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ORDER

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=> the sum of the powers of the concentration terms in rate law expression

=> it is determined experimentally

=> it can be a whole number, zero or even fraction

=> provides some ideas about. Reaction mechanism

MOLECULARITY

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=> it is the number of reacting species undergoing simultaneous collision in the reaction

=> it is a theoretical concept

=> it always a whole number

=> does not tell us the reaction mechanism