Question

The rate of the reaction \[\ce{A + B -> C}\] is 3.6 × 10⁻² mol dm⁻³ s⁻¹ when [A] = 0.3 mol dm⁻³ and [B] = 0.2 mol dm⁻³. Calculate k if reaction is first order in A and zero order in B.

Options

• 0.036 s⁻¹

• 0.009 s⁻¹

• 0.18 s⁻¹

• 1.8 s⁻¹

Answer 1

0.18 s⁻¹

Explanation:

The reaction \[\ce{A + B -> C}\] is first order in A and zero order in B; hence, the rate law of the reaction is Rate = k[A]

Rate = 3.6 × 10⁻² mol dm⁻³ s⁻¹

[A] = 0.3 mol dm⁻³, [B] = 0.2 mol dm⁻³

3.6 × 10⁻² mol dm⁻³ s⁻¹ = k × (0.3 mol dm⁻³)

k = 0.18 s⁻¹