Question

`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`

Answer 1

Correct Answer - 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`.