Steam enters a superheater at 9 bar with 95 % dry quality and leaves at 250 °C at constant pressure. Find the change in entropy per unit mass (answer in kJ/kg·K). c_{p} (superheated) = 2.2 kJ/kg·K; at 9 bar s_{f} = 2.2, s_{fg} = 4.12, s_{g} = 6.32 kJ/kg·K, T_{sat} = 175.4 °C. Use the property values given here.