The Ksp (25) of sparingly soluble salt XY2(s) is 3.56X10-5(mol lit-1)3 and at 30 the vapour presence of its saturated solution in water is 31.78 mm Hg. Calculate the enthalpy change of the reaction.
Given: Vapour pressure of pure water=31.82 mm Hg
(a) 42.5 kJ/mol.
(b) 32.1 kJ/mol.
(c) 24.5 kJ/mol.
(d) 52.5 kJ/mol.