- A sample of 1.9 mol of liquid X solidifies at 268 K. The normal melting point of the liquid XTm = 292 K. Calculate the change in the entropy of the sample, of the surroundings and the total change in the entropy. Enthalpy of fusion of compound X = 6.67 kJ/mol. Molar heat capacities: Cp,m (X, liq) = 68.08 J/K.mol, Cp,m X, 5) = 37.04 J/Kmol Answer: AS system K = ( ) = -38.343 AS = 48.248 X Ssur(3)= Aspanol )= 995 = X