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Postby Kim » Wed Jan 25, 2017 7:03 pm

are all exothermic reactions favorable? and all endothermic not favorable?

Joyce Wu 3E
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Re: favorability

Postby Joyce Wu 3E » Wed Jan 25, 2017 8:34 pm

It is not as black and white as that. An endothermic reaction can be spontaneous (favorable) as well. For example, Gibbs free energy is determined by enthalpy, temperature, and entropy (delta(G) = delta(H) - T(Delta(S)). So when delta(H) is positive it means its endothermic. In this case, if delta(S) is also positive, this reaction will be spontaneous at a higher temperature.

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