Last updated on June 13th, 2020 at 08:27 pm
Differences between order and molecularity:
It is the sum of powers of the concentrations in the rate law expressions.
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.
Molecularity is defined for elementary reactions.
Order might involve one elementary reaction or it might involve a sequence of elementary reactions.
Molecularity is a part of the whole reaction.
It is an experimentally determined value.
It is a theoretical concept.
It can have fractional value.
It is always a whole number.
It can assume zero value.
It can not have zero value.
Order of a reaction can change with the conditions such as pressure, temperature, concentration etc.
Molecularity is invariant for a chemical equation.