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Question

For a particular reaction, ΔHo=33.9 kJ and ΔSo=113 J K1 mol1. This reaction is:


Your Answer
A
Spontaneous at all temperatures
Your Answer
B
Non-spontaneous at all temperatures
Correct Answer
C
Spontaneous at temperatures below 27 oC
Your Answer
D
Spontaneous at temperatures above 27 oC

Solution

The correct option is D Spontaneous at temperatures below 27 oC
By using relation,
ΔG=ΔHTΔS
We know that,
For spontaneous process,
ΔG<0
ΔHTΔS<0
ΔHΔS<T
Substituting the values, we get
33.9×1000113<T
T>300 K,i.e. 27 oC

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