difference between order and molecularity of reaction?
| Order | Molecularity |
|---|---|
| It is the sum of powers of the concentrations in the rate law expressions. | It is the number of moleculesr of the reactants taking part in an elementary reaction. |
| Order corresponds to the overall reaction. | Molecularity is 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. |