19. For the reaction 2 A(g) + B(g) → 2D(g)
ΔU° = – 10.5 kJ and ΔS? = – 44.1 JK–1.
Calculate ΔG? for the reaction, and predict whether the reaction may occur spontaneously.
19. For the reaction 2 A(g) + B(g) → 2D(g)
ΔU° = – 10.5 kJ and ΔS? = – 44.1 JK–1.
Calculate ΔG? for the reaction, and predict whether the reaction may occur spontaneously.
19. ΔH° = ΔU° + Δng RT
ΔU° = -10.5 kJ, Δng = 2-3 = -1 mol, R = 8.314 x 10-3 kJ mol-1, T = 298 K
ΔH° = (- 10.5 kJ) + [ (- 1 mol) x (8.314 x 10-3 kJ mol-1) x (298 K)]
= -10.5 kJ – 2.478 kJ
= -12.978 kJ
According to Gibbs Helmholtz equation:
ΔG° = ΔH° - TΔS°
= (- 12.978 kJ) – (298 K) x (
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