Gibbs Free Energy and Stability






Moderators: Chem_Mod, Chem_Admin

Niveda_Tennety_1H
Posts: 21
Joined: Wed Sep 21, 2016 2:59 pm

Gibbs Free Energy and Stability

Postby Niveda_Tennety_1H » Sun Feb 12, 2017 1:17 am

For question 9.63, the answer key says that "Compounds with a positive free energy of formation are unstable with respect to the elements." Are spontaneous reaction not unstable (Gibbs free energy for spontaneous reactions is negative, right)?

Chem_Mod
Posts: 17684
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 404 times

Re: Gibbs Free Energy and Stability

Postby Chem_Mod » Sun Feb 12, 2017 11:29 am

It is all relative. If the compound has a higher free energy relative to the elements, then the formation of the compound is non spontaneous, you are putting energy into the compound, and the compound is less stable relative to the elements.

Yes, if the compound has a lower free energy relative to the elements, the reaction is spontaneous, and the compound is more stable relative to the elements. The universe tends toward disorder, and release of energy increases entropy.


Return to “Gibbs Free Energy Concepts and Calculations”

Who is online

Users browsing this forum: No registered users and 1 guest