Question
Distinguish between order and molecularity of a reaction.
✓
Answer
| Order | Molecularity |
| 1. It is the sum of the exponents to which the concentration terms in rate law expression are raised. | 1. ¡t is the number of molecules (or atoms or ions) of the reaCtants taking part in the elementary reaction. |
| 2. It is experimentally determined and indicates the dependence of the reaction rate on the concentration of particular reactants. | 2. It is the oretical property and indicátes the number of molecules of reactant in each step of the reaction. |
| 3. It may have values that are integer, fractional, or zero. | 3. It is always an integer. |
| 4. Its value depends upon experimental conditions. | 4. Its value does not depend upon experimental conditions. |
| 5. It is the property of elementary and complex reactions. | 5. It is the property of elementary reactions only. |
| 6. Rate law expression describes the order of the reaction. | 6. Rate law does not describe molecularity. |
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