Question

The unit of frequency factor in Arrhenius equation is ____

(a) \(\frac{mol}{m^3} \)

(b) Same as that of rate constant

(c) \(\frac{mol}{m^3×s} \)

(d) mol

I got this question in exam.

This question is from Reaction Rates topic in division Basic Concepts of Chemical Reaction Engineering

Answer 1

Correct option is (b) Same as that of rate constant

Best explanation: The unit of frequency factor in Arrhenius equation is same as that of rate constant.

Arrhenius equation is, k = A e^-Ea/RT,

k: Rate constant

A: Frequency factor

The exponent term in Arrhenius equation gives an integer. Hence, unit of A depends on that of k.