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Question

P(g)+2Q(g)PQ2(g);ΔH=18 kJ mol1
The entropy change of the above reaction (ΔSsystem) is 60 J K1 mol1 At what temperature, the reaction becomes spontaneous?

A
Below 200 K
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B
Above 300 K
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C
Below 300 K
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D
Above 200 K and below 300 K
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Solution

The correct option is B Above 300 K
For spontaneous process, ΔG<0
ΔHTΔS<0,ΔH<TΔST>ΔHΔS=1800060=300 K

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