For the reaction at 298 K, `2A + Bto C Delta H = 400 "kJ mol"^(-1) and Delta S = 0.2 "kJ K"^(-1) "mol"^(-1)` At what temperature will the reaction become spontaneous considering `Delta H and Delta S` to be constant over the temperature range.

Explanation

For balanced reaction `Delta G =0`
`therefore Delta G = Delta H - T Delta S`
`O = Delta H - T Delta S`
`therefore T = (Delta H )/ (Delta S ) = (400)/(0.2) = 2000 K`
`therefore` At 2000 K temperature of the reaction is equilibrium. So the reaction will be spontaneous over the range of the temperature 2000 K.