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F(2)C=CF-CF = CF(2) rarr F(2)underset(FC...

`F_(2)C=CF-CF = CF_(2) rarr F_(2)underset(FC=)underset(|)(C)-underset(CF)underset(|)(CF_(2))`
For this reaction (ring closure), `DeltaH =- 49 kJ mol^(-1), DeltaS =- 40.2 J K^(-1) mol^(-1).Up` to what temperature is the forward reaction spontaneous?

A

`1492^(@)C`

B

`1219^(@)C`

C

`946^(@)C`

D

`1080^(@)C`

Text Solution

Verified by Experts

The correct Answer is:
C
For spontaneous process,
`DeltaG=DeltaH-TDeltaS` (should e negative)
`thereforeT gt (DeltaH)/(DeltaS)`
`T gt (-49xx1000)/(-40.2)`
`T gt 1219K`, i.e., `946^(@)C`.
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