Question

Why is it more convenient to predict spontaneity of reaction in terms of delta g rather than delta s?

Answer 1

we know that Delta s is change in entropy of reaction. ie it should be a +ve value to make the reaction occur spontaneously .

∆s >0 - spontaneous rk

∆s=0 - in equilibrium state

∆s<0 - non spontaneous rk

and ∆G is the change in free energy of any rk n it sud always be -ve value for any spontaneous rk

∆G<0 - spontaneous rk

∆G=0 -in eqb state

∆G>0 -non spontaneous rk

moreover entropy is the result of molecular randomness of any system which is not a finite parameter to predict spontaneity of a rk as it may be affected by external factors of temp n pressure whereas change in free energy is more suitable to determine the spontaniety as by this way we take in consideration the study of system only n not surrounding.

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