Gibbs free energy






Moderators: Chem_Mod, Chem_Admin

Eileen Si 1G
Posts: 120
Joined: Fri Aug 30, 2019 12:17 am

Gibbs free energy

Postby Eileen Si 1G » Sat Feb 15, 2020 1:07 am

Why does Gibbs free energy depend on the equilibrium constant and pressure? Also, is Gibbs free energy a state function?

Fiona Latifi 1A
Posts: 102
Joined: Sat Sep 14, 2019 12:16 am

Re: Gibbs free energy

Postby Fiona Latifi 1A » Sat Feb 15, 2020 11:23 am

Gibbs free energy is a state function because it is determined by enthalpy and entropy, which are also state functions.

Kristina Rizo 2K
Posts: 105
Joined: Wed Sep 18, 2019 12:19 am

Re: Gibbs free energy

Postby Kristina Rizo 2K » Sat Feb 15, 2020 11:31 am

Yes it is a state function.

Veronica_Lubera_2A
Posts: 106
Joined: Sat Sep 14, 2019 12:16 am
Been upvoted: 1 time

Re: Gibbs free energy

Postby Veronica_Lubera_2A » Sat Feb 15, 2020 12:07 pm

At equilibrium, DeltaG=0 because the forward and backward reaction rates are equal. So the formula for nonstandard conditions (including not at equilibrium) is Delta G= DeltaG* + RT lnQ, where Q is the reaction quotient ([Products]/[Reactants]). At equilibrium, the Q variable would become K.

Callum Guo 1H
Posts: 134
Joined: Fri Aug 02, 2019 12:15 am
Been upvoted: 1 time

Re: Gibbs free energy

Postby Callum Guo 1H » Sat Feb 15, 2020 3:19 pm

yes, gibbs free energy is a state function

Nicholas_Gladkov_2J
Posts: 125
Joined: Sat Aug 17, 2019 12:17 am

Re: Gibbs free energy

Postby Nicholas_Gladkov_2J » Sat Feb 15, 2020 10:05 pm

Eileen Si 1G wrote:Why does Gibbs free energy depend on the equilibrium constant and pressure? Also, is Gibbs free energy a state function?


Yes! Gibbs free energy, G, is a state function. It it determined by its current state. This allows us to calculate the chnage based upon the final and inital values-- this is similar to entropy, S, and enthalpy, H.


Return to “Gibbs Free Energy Concepts and Calculations”

Who is online

Users browsing this forum: No registered users and 3 guests