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Delta G

Posted: Thu Feb 14, 2019 5:03 pm
by Kirsty Star 2H
How can you tell if increasing temperature will increase or decrease the stability of a molecule?

Re: Delta G

Posted: Thu Feb 14, 2019 5:27 pm
by Heesu_Kim_1F
The Gibbs free energy equation is (delta G) = (delta H) - (temperature)(delta S).
When (delta S) is positive and (delta H) is positive, then the reaction will be spontaneous at high temperature.
When (delta S) is positive and (delta H) is negative OR when (delta S) is negative and (delta H) is positive, the temperature will not affect spontaneity.
When (delta S) is negative and (delta H) is negative, then the reaction will be spontaneous at low temperature.
Hope this helps!

Re: Delta G

Posted: Fri Feb 15, 2019 10:04 am
by Theodore_Herring_1A
The formula for Gibbs free energy is deltaG = deltaH - TdeltaS

If deltaG is negative, the reaction is spontaneous. If it is positive, the reaction is not spontaneous.

Thus, the higher the temperature, the lower the Gibbs free energy, making it more spontaneous, and thus less stable.