An exothermic reaction A---> B is spontaneous in the backward direction. What will be the sign of ΔS for the forward reaction?

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1 Answers

Backward reaction will be endothermic. Thus, energy factor opposes the backward reaction .As backward reaction is spontaneous, randomness factor must favour, i.e., ΔS will be +ve for backward reaction or it will be –ve for forward reaction. 

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