The Total solution for NCERT class 6-12
For the reaction at 298 K,
2A + B → C
ΔH = 400 kJ mol–1 and ΔS =0.2 kJ K–1 mol–1
At what temperature will the reaction becomespontaneous considering ΔH and ΔS to be constant overthe temperature range?
From the expression,
ΔG = ΔH – TΔS
Assuming the reaction at equilibrium, ΔT forthe reaction would be:
(ΔG = 0 at equilibrium)
T = 2000 K
Forthe reaction to be spontaneous, ΔG must be negative. Hence, for thegiven reaction to be spontaneous, T should be greater than2000 K.