What fraction of collisions will have sufficient energy to react for a gas whose activation energy is 68kJ/mol at 25° C


I converted 68 kj to 68000 j and the temp to 293.15 K

I thought I was to use aeranheus equation but when I plug everything in I end up with

K/a = .97


So I have two variables.. Not sure what went wrong.

Any ideas ?

I believe this should be right:

So the original equation is k = A*e^(-Ea/RT), where k = rate constant, A = pre-exponential factor, Ea = activation energy, R = gas constant, T = absolute temperature.

A, or the pre-exponential factor, is equal to the total # of collisions that occur per second, regardless of whether they have enough activation energy. By multiplying this A by "e^(-Ea/RT)", you get the amount of collisions with sufficient energy / unit time (rate constant). therefore, "e^(-Ea/RT)" should be the fraction of collisions with sufficient energy.

rate rxn = total # collisions/unit time * fraction collisions w/ enough energy

This post was edited by cialda on Mar 3 2014 09:03pm