Graphs of Gibbs Free Energy vs. Energy

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Alexis Elliott 1J
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Joined: Wed Sep 21, 2016 2:59 pm

Graphs of Gibbs Free Energy vs. Energy

Postby Alexis Elliott 1J » Thu Mar 02, 2017 10:51 pm

Looking through the course reader, the graphs that depict Gibbs Free Energy vs. Reaction time and graphs that depict Energy vs. reaction time look the same. G and E are obviously not interchangeable but in what cases would we be given a graph with Gibbs Free Energy, and in what cases would we be given graphs with Energy?

Thank you!

Chem_Mod
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Re: Graphs of Gibbs Free Energy vs. Energy

Postby Chem_Mod » Fri Mar 03, 2017 3:04 pm

Even though Gibbs Free Energy and Potential Energy may seem similar, they should not be confused and should not be interchanged. Gibbs free energy is the energy available to do non-expansion work, so it is a subset of the total potential energy. So if we express the y-axis in potential energy the humps get bigger.

nick_pantoja_3G
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Joined: Sat Jul 09, 2016 3:00 am

Re: Graphs of Gibbs Free Energy vs. Energy

Postby nick_pantoja_3G » Fri Mar 03, 2017 3:21 pm

I also believe if it is talking about activation energy then the reaction profile will be energy on the y-axis, while if they give you standard free energy of activation then the y axis would be gibbs free energy


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