Question

Unit of frequency factor $(A)$ is :

• A. mol/L
• B. mol/L $\times$ s
• C. depends upon order
• D. it does not have any unit

Answer 1

Answer: (C)

Arrhenius' equation gives the dependence of the rate constant of a chemical reaction on the absolute temperature, a pre-exponential factor and other constants of the reaction.
$k = Ae \frac{ E _{ 0 }}{ k , t }$
where $A =$ Frequency factor
The units of the pre-exponential factor A are identical to those of the rate constant and will vary depending on the order of the reaction