## Calculating activation energy from Arrhenius equation

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

Nancy Le - 1F
Posts: 52
Joined: Fri Sep 29, 2017 7:07 am

### Calculating activation energy from Arrhenius equation

If given 2 rate constants and the corresponding temperatures, like in exercise 61, does it matter which one we assign as k1,k2,T1,T2?

Angela G 2K
Posts: 30
Joined: Fri Sep 29, 2017 7:06 am

### Re: Calculating activation energy from Arrhenius equation

Just tried switching k1, k2, T1, T2 and the answer was the same, so I guess the order doesn't matter. Just make sure the you use the correct temperature for their respective rate constants.

Mathematically it works out, since a higher temperature gives a larger rate constant. If you use the bigger temp/rate constant as k2/T2, then you'll get a positive multiplying a positive, and if you switch it and make it k1/T1 instead, you'll get a negative multiplying a negative, resulting in the same positive answer.