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A process has Delta H= 200 J mol^(-1) an...

A process has `Delta H= 200` J `mol^(-1)` and `DeltaS=40" JK"^(-1)mol^(-1)`. Out of the values given below, choose the minimum temperature above which the process will be spontaneous :

A

5K

B

12 K

C

4 K

D

20 K

Text Solution

Verified by Experts

The correct Answer is:
A
For the process to be spontaneous `DeltaG : =-ve`
`DeltaG = DeltaH - Delta(TS)`
At a particular temperature `DeltaG = DeltaH - TDeltaS`
For spontaneity `DeltaS lt 0`
`TDeltaS gt DeltaH`
`T(40) gt 200 , T = 5K rArr T gt 5`
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