Exo-Endothermic Rxn?

[Dencology]

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1.can an endothermic rxn be spontaneous?
2.if a rxn is endothermic and nonspontaneous, could the reverse be exothermic and spontaneous?

 

[chessxwizard]

1. Yes, if the reaction has a substantial increase in entropy.
2. Yes, it could be spontaneous depending on the magnitude of the enthalpy, temperature, and entropy change.

ie. If the forward reaction has large, positive enthalpy change and a small negative entropy change it would be non-spontaneous. The reverse reaction would have a large, negative enthalpy change and a small positive entropy change, which would make the Gibbs free energy change negative and the reaction spontaneous.

 

[Dencology]

great. thanks. i love your explanations.