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Why most of the exothermic process (reactions) spontaneous?

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Why most of the exothermic process (reactions) spontaneous?

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ΔG = ΔH - ΔH - TΔS; For exothermic reactions ΔH is -ve. For a spontaneous process AG is to be -ve. 

Thus decrease in enthalpy (-ΔH) contributes significantly to the driving force (to make AG negative).

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