## calculating A in Arrhenius equation

Arrhenius Equation: $\ln k = - \frac{E_{a}}{RT} + \ln A$

hanna_maillard3B
Posts: 61
Joined: Fri Sep 28, 2018 12:23 am

### calculating A in Arrhenius equation

how do we calculate A in the Arrhenius equation - I understand that it's the frequency of collision but how do we know what that number is ?

Joonsoo Kim 4L
Posts: 61
Joined: Fri Sep 28, 2018 12:29 am

### Re: calculating A in Arrhenius equation

To my understanding, A depends on the steric factor (fraction of collisions with the correct orientation) and the collision frequency, but I am pretty sure that we won't have to calculate A and it will be given to us.

taywebb
Posts: 60
Joined: Fri Sep 28, 2018 12:15 am

### Re: calculating A in Arrhenius equation

From the practice problems and textbook, I think it is safe to assume they will give us A in a chart or just in the question of the problem.