What are the differences between order and molecularity ?




Differences between order and molecularity:



Order
No.
Molecularity
It is the sum of powers of the concentrations in the rate law expressions.
01
It is the number of molecular of reactants taking part in an elementary reaction or in a rate determining step of a complex reaction.
Order corresponds to the overall reaction.
02
Molecularity is defined for elementary reactions.
Order might involve one elementary reaction or it might involve a sequence of elementary reactions.
03
Molecularity is a part of the whole reaction.
It is an experimentally determined value.
04
It is a theoretical concept.
It can have fractional value.
05
It is always a whole number.
It can assume zero value.
06
It can not have zero value.
Order of a reaction can change with the conditions such as pressure, temperature, concentration etc.
07
Molecularity is invariant for a chemical equation.

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