Q.

If a reaction has a positive enthalpy change and positive entropy change it can be spontaneous when TS is large enough to outweight H . Select the way(s) in which the above statement can happen.

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a

The positive entropy change of the system can be large in which case T may be small

b

The positive entropy change of the system can be small in which case T must be large

c

None of the above

d

Both (1) and (2)

answer is C.

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Detailed Solution

G=H-TS

For spontaneous process G=-Ve

Case I

H ; = +ve S= +Ve ; T = large and S = small ;TS > H ;G = -ve  spontaneous

Case II 

H; = +ve S= +Ve ;T = small and S = large ; TS>H;G = -ve

spontaneous

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If a reaction has a positive enthalpy change and positive entropy change it can be spontaneous when T∆S is large enough to outweight ∆H . Select the way(s) in which the above statement can happen.