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

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.