The following reaction is second order in [A] and the rate constant is 0.039 M^-1s^-1: A → B
The concentration of A was 0.30 M at 23 s. The initial concentration of A was __________ M.

Question

The following reaction is second order in [A] and the rate constant is 0.039 M^-1s^-1: A → B The concentration of A was 0.30 M at 23 s. The initial concentration of A was __________ M.

Quizplus · Accepted Answer

For a second-order reaction, the integrated rate law is 1/[A] = kt + 1/[A]₀. Plugging in the given values (k = 0.039 M⁻¹s⁻¹, t = 23 s, [A] = 0.30 M), we solve for [A]₀ to find it is approximately 0.41 M.

The Following Reaction Is Second Order in [A] and the Rate