Why does Gibbs free energy have to be negative?
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Gibbs free energy is negative for a spontaneous reaction (only). It can be positive as well, for reactions that are not spontaneous.
If the free energy is negative, we are looking at changes in enthalpy and entropy that favour the process and it occurs spontaneously. This includes exothermic reactions in which the entropy increases, or exothermic reactions which have small decreases in entropy (as long as the temperature is relatively high), and endothermic reactions which are accompanied by large increases in entropy (like evaporation of water).
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