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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