Second Order Reaction

Question

The second order reaction A → Products takes 13.5 s for the concentration of A to decrease from 0.740 M to 0.333 M. What is the value of k for this reaction?

Answer 1

The integrated rate equation for a 2nd order reaction is...

1/[A] = 1/[A]_o + kt

Solving for k, we have ...

1/0.333 M = 1/0.740 M + (k)(13.5 s)

3.00 = 1.35 + 13.5 k

1.65 = 13.5 k

k = 0.122 M^-1s^-1