A process which is unfavorable with respect to enthalpy, but favorable with respect to entropy?

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A process which is unfavorable with respect to enthalpy, but favorable with respect to entropy, could occur at a high temp but not a low temp, OR could occur at a low temp but not a hight temp?

Hermina Ferry · Accepted Answer

It could occur at a high temperature.Reactions that don't favor enthalpy are endothermic so you can think of them needing to absorb heat (they do tend to have a higher activation energy). It's proven in gibbs function. Change in free Energy = change in heat - temperature * change in entropy(where you want the change in free energy to be negative)Basically the change in entropy become more important at higher temperatures.

Hermina Ferry · Answer

It can occur at a high temp. , but not at a low temp. If it is unfavorable with respect to enthralled, that means delta H is positive. If it is favorable with respect to entropy, that means delta S is Also positive. As you raise temp, and multiply it by delta S, eveventually it will be greater than delta H, making delta G negative when you subtract the two. Negative delta G makes the process favorable, even though it is unfavorable with respect to enthalpy, it will be a spontaneous reaction.

Jakob Littel

A process which is unfavorable with respect to enthalpy, but favorable with respect to entropy?

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