Gibbs Free Energy Defined
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Gibbs free energy change combines a reaction's enthalpy and entropy changes at a given temperature: ΔG = ΔH − TΔS.
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A reaction with ΔH negative and ΔS positive combines both favorable terms into a ΔG that is negative at every temperature.
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ΔG folds enthalpy and entropy into one number — reading either alone, without the other, misses what actually decides spontaneity.