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Question

For reaction, Ag2O(s)2Ag(s)+(1/2)O2(g), the value of ΔH=30.56 kJ mol1 and ΔS=66 JK1 mol1. Temperature at which free energy change for reaction will be zero, is:

A
373K
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B
413K
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C
463K
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D
493K
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Solution

The correct option is C 463K
As we know at ΔG=0, the equilibrium is attained.
ΔG=ΔHTΔS
TΔS=ΔH ( as ΔG=0)
T=ΔHΔS
T=30.56×10366 K.
So, the temperature at which free energy change for the reaction will be zero is 463 K.

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