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Spontaneous Reaction

Posted: Sun Feb 17, 2019 9:12 pm
by Semi Yoon
When enthalpy change and entropy change are negative, why does the spontaneity depend on temperature?

Re: Spontaneous Reaction

Posted: Sun Feb 17, 2019 9:26 pm
by 505095972
The equation ∆G=∆H-T∆S shows that even if ∆H and ∆S are negative, T can change the value of the second term and affect spontaneity. More specifically, if ∆S is negative, then the second term would be positive, and if T were great enough, it would make ∆G positive, which would make it non spontaneous even if ∆H and ∆S were negative.