Question

Differentiate between order of chemical reaction and molecularity by giving an example.

Hint:

Order of reaction is determined experimentally, while molecularity is a theoretical concept for elementary reactions.

Answer 1

Step 1: Definitions - Order of a reaction: The sum of the powers of concentration terms in the rate law.
- Molecularity: The number of reacting species involved in an elementary reaction. Step 2: Example For the reaction: \[ 2A + B \rightarrow C \] If the rate law is: \[ \text{Rate} = k[A]^1[B]^1 \] - The order of reaction is \(1+1 = 2\).
- If the reaction occurs in one step with three reactants colliding, its molecularity is 3.