## arrhenius equation

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

juchung7
Posts: 44
Joined: Fri Sep 29, 2017 7:05 am

### arrhenius equation

What is the value of A exactly? What does it stand for/mean in terms of rates and the rate constant?

Minie 1G
Posts: 63
Joined: Fri Sep 29, 2017 7:04 am

### Re: arrhenius equation

A is the pre-exponential factor. It is the fraction of molecules that would react if the activation energy was zero (if Ea is 0, e^0/RT would be 1 so your arrhenius equation would be k=a).

A is usually determined with experimental data, since it's different for different reactions.