Question

At 60°C, dinitrogen tetroxide is 50 per cent dissociated. Calculate the standard free energy change at this temperature and at one atmosphere.

For an isolated system, ∆U = 0, what will be ∆S ?

For the reaction at 298 K, 2A + B → C ∆H = 400 kJ mol–1 and ∆S = 0.2 kJ K–1 mol–1 At what temperature will the reaction become spontaneous considering ∆H and ∆S to be constant over the temperature range.

For the reaction 2 A(g) + B(g) → 2D(g) ∆U⊖ = –10.5 kJ and ∆S⊖ = –44.1 JK–1. Calculate ∆G⊖ for the reaction, and predict whether the reaction may occur spontaneously.