Question

The rate law for the reaction

2H2(g) + 2NO(g) ⟶ N2(g) + 2H2O(g) is rate=k[H2][NO]2. 

What is the overall order of the reaction?

3

2

4

7

Answer 1

The overall order of the reaction is 3.

The rate law is rate = k[H₂]¹[NO]².

The overall order is the sum of the exponents of the concentrations.

∴ Overall order = 1 +2 = 3.

The reaction is first order in [H₂], second order in [NO], and third order overall.