4. A sample of a pure substance was cooled to -1.45 °C at a pressure of 4.75 bar. A liquid phase and a vapor phase formed and were observed to be in equilibrium.While in equilibrium, the properties of each phase were determined.Unfortunately, your crimson sweltered colleague failed to record the entropy of the liquid and you have a presentation to your senior management in 7 min.Please calculate the sap in kJ/K-kmole from the data below.

Fig: 1

Fig: 2