Chemistry

Problem

A reaction takes place in three steps. The rate constants are

k_1

k_2

and

k_3

. The overall rate constant is:

k = \frac{k_1 k_3}{k_2}

. If (energy of activation)

E_1

E_2

and

E_3

are 60, 30 and 10 kJ. The overall energy of activation is: (A) 40 (B) 30 (C) 400 (D) 60