What is overall pre-exponential factor of reaction, if steps (1) to (4) are much faster than (5)? — Chemical Kinetics Chemistry Question

💡 Solution & Explanation

The overall rate constant K = K5 K3 K1^1/2 / (K4 K2^1/2). Substituting the Arrhenius equation (K = A e^-Ea/RT) for each rate constant, the pre-exponential factors multiply and divide in the exact same manner as the rate constants: A_overall = A5 A3 A1^1/2 / (A4 A2^1/2). Therefore, correct answer is A.