Question

The rate constant of a reaction is 2 × 10⁻² L mol⁻¹ s⁻¹. What is the order of reaction?

Answer 1

Given:

Rate constant, k = 2 × 10⁻² L mol⁻¹ s⁻¹

Compare with the general unit formula for the rate constant:

Units of k = mol¹⁻ⁿ Lⁿ⁻¹ s⁻¹

Let’s match k = L mol⁻¹s⁻¹ = mol⁻¹ L s⁻¹

This matches when 1 − n = −1

⇒ n = 2