The half life of the first order reaction is 5.20*10^1 at 545K. Find the rate constant when the initial concentration is 0.030 M.

Answer 1

The half life for a 1st order reaction is given by

t_1/2 = ln 2 / k = 0.693 / k

5.20x10¹ s = 0.693 / k

k = 0.0133 s^-1

The initial concentration doesn't enter into the calculation, because the rate constant is independent of the initial concentration.