The dissociation vapour pressure of a salt A2B(s) ⇋ A2(g) + B(g) at 367 °C is 208 kPa but at 477 °C it has risen to 547 kPa. For the dissociation reaction of A2B(s), calculate (i) the equilibrium constant, (ii) the standard reaction Gibbs energy, (iii) the standard enthalpy, and (iv) the standard entropy of dissociation, all at 422 °C. Assume that the vapour behaves as a perfect gas and that ΔrH⦵ and ΔrS⦵ are independent of temperature in the range given.

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