At a certain temperature 'T',the endothermic reaction A rarrB proceeds virtually to the end. Determine. (i) Signof DeltaS for this reaction(ii) sign of DeltaS for the reaction B rarr A at the temperature T, and (iii) the possibility of reaction B rarr A proceeding at a low temperature.

At a certain temperature 'T',the endothermic reaction A rarrB proceeds

1.	At a certain temperature 'T',the endothermic reaction A rarrB proceeds virtually to the end. Determine. (i) Signof DeltaS for this reaction(ii) sign of DeltaS for the reaction B rarr A at the temperature T, and (iii) the possibility of reaction B rarr A proceeding at a low temperature.
Answer» Solution :(i) Energyfactor opposes. So enthalpy factor must favour, i.e.,`DELTAS` must be positive. (II) For `A rarr B, DeltaG` is `-ve` , therefore,for `B rarr A,DeltaG` will be `+ve`. (III) For `B rarr A , DeltaH = -ve` and `DeltaS` is ALSO `-ve , i.e.,DeltaS` opposes the process but a lowtemp.,`T DeltaS`may be so low that `DeltaH`is greater in magnitude than `T DeltaS` and the process will be SPONTANEOUS.