Ms. Kiarra Romaguera
Nov 22, 2024
A process which is unfavorable with respect to enthalpy, but favorable with respect to entropy?
What is a process that is unfavorable in terms of enthalpy but favorable in terms of entropy? Can such a process occur at high temperatures but not at low temperatures, or could it occur at low temperatures but not at high temperatures?
2 Answers
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.
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.
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