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In a spontaneous reaction, enthalpy is negative, entropy is positive and Gibbs Free Energy is negative. In a nonspontaneous reaction, enthalpy is positive, entropy is negative and Gibbs Free Energy is positive.
There are two other cases where temperature has to be considered. If enthalpy is positive but entropy is also positive, at high temperatures the reaction would have a negative change in free energy and is spontaneous; if enthalpy is negative but entropy is also negative, at low temperatures the reaction would have a negative change in free energy and is also spontaneous.
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