Gibbs energy graph

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nshahwan 1L
Posts: 100
Joined: Fri Aug 30, 2019 12:18 am

Gibbs energy graph

Postby nshahwan 1L » Tue Jan 21, 2020 7:03 pm

Could someone explain the Gibbs free-energy curve shown in figure 5I.3 in the book. The book explains it but I don't quite have a grasp of it.

Skyllar Kuppinger 1F
Posts: 52
Joined: Thu Jul 25, 2019 12:16 am

Re: Gibbs energy graph

Postby Skyllar Kuppinger 1F » Tue Jan 21, 2020 9:37 pm

graph a is showing an exothermic reaction. The Gibbs free energy starts high and ends low, meaning the net change in free energy is negative. we know that if delta G is negative, then the rxn is exothermic. this also means that the reaction lies to the right, so K > 1. Graph b is showing an endothermic rxn, where the net change in Gibbs free energy is positive. this also means that the reaction lies to the left, so K<1.

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