What are the units of activation energy?

Arrhenius Equation:

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Harjas Sabharwal 1G
Posts: 42
Joined: Sat Jul 22, 2017 3:01 am

What are the units of activation energy?

Postby Harjas Sabharwal 1G » Fri Mar 16, 2018 10:15 pm

Do we use J/mol or J for activation energy?

Nickolas Manipud 1C
Posts: 60
Joined: Fri Sep 29, 2017 7:07 am

Re: What are the units of activation energy?

Postby Nickolas Manipud 1C » Fri Mar 16, 2018 10:20 pm

You use J/mol.

Look at the Arrhenius equation, k = A*e^(-Ea/RT). R has units of J*K-1*mol-1 while T has units of K. The K will cancel out so what you have left is J*mol-1. You want to cancel both of these out which can be done with Ea with units of J*mol-1.

Jonathan Tangonan 1E
Posts: 50
Joined: Sat Jul 22, 2017 3:01 am

Re: What are the units of activation energy?

Postby Jonathan Tangonan 1E » Fri Mar 16, 2018 10:23 pm

You would use J/mol. The J*mol-1 cancel out with the units of the R constant which has JK-1mol-1


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