Distinguish between order and molecularity of a reaction.
Q.8 Distinguish between order and molecularity of a reaction.
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| Order | Molecularity |
|---|---|
| It is the sum of the powers of the concentration terms in the experimentally determined rate law. | It is the number of reactant molecules (atoms/ions) taking part in an elementary step. |
| It is determined experimentally. | It is a theoretical concept based on the mechanism. |
| It can be zero, a whole number or a fraction. | It is always a whole number (1, 2 or rarely 3), never zero or fractional. |
| It applies to the overall reaction. | It applies to each elementary step; it has no meaning for a complex overall reaction. |
Doubtly AI
· 28 Oct 2026
AI-verified · Oct 2026
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