Q.

For this reaction ΔH=–40.2 kJ mol–1, ΔS=–40.2 Jk−1 mol–1  .Upto what temperature is the forward reaction is spontaneous?

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a

14920 C

b

12190C

c

7270C

d

10000C

answer is C.

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Detailed Solution

ΔG=ΔH−TΔS∆G=0...at equilibrium ∆H-T∆S=0 ∆H=T∆S ∆HT∆S=Teq 40.2×100040.2=Teq'T' less than 1000 K, process is spontaneousboth ∆H and ∆S are -ve Thus temperature less than 7270c makes the process spontaneous
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