Spontaneous Reaction

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Semi Yoon
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Joined: Fri Sep 28, 2018 12:27 am

Spontaneous Reaction

Postby Semi Yoon » Sun Feb 17, 2019 9:12 pm

When enthalpy change and entropy change are negative, why does the spontaneity depend on temperature?

Posts: 69
Joined: Fri Sep 28, 2018 12:17 am

Re: Spontaneous Reaction

Postby 505095972 » Sun Feb 17, 2019 9:26 pm

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.

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