calculating A in Arrhenius equation

[hanna_maillard3B]

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]

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]

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.