### Gibbs free energy and temperature

Posted:

**Sun Mar 03, 2019 7:43 pm**What's the relationship between Gibbs Free Energy and the temperature in the equation(s)?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=141&t=43532

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Posted: **Sun Mar 03, 2019 7:43 pm**

What's the relationship between Gibbs Free Energy and the temperature in the equation(s)?

Posted: **Sun Mar 03, 2019 7:53 pm**

As the temperature increases and the change in enthalpy and the change in entropy stay constant, the change in gibbs free energy decreases and vice versa. This can be seen in the equation ∆G = ∆H - T∆S.

Posted: **Sun Mar 03, 2019 11:32 pm**

Adding on, many questions deal with how temperature affects Gibbs free energy. For example, determining the temperature when the reaction changes from spontaneous to nonspontaneous is in other words finding the temperature when Gibbs free energy changes from a negative value to a positive value. So there is a strong relationship between temperature and Gibbs free energy.

Posted: **Tue Mar 05, 2019 4:44 pm**

Temperature is a factor of TΔS, so a high temperature will favor spontaneity if ΔS is positive and will not favor spontaneity if ΔS is negative.