n-Octane is compressed reversibly at constant temperature along the critical isotherm until the critical point is reached. The initial pressure is 1 bar. The pressure takes place in a closed system. Use the Lee-Kesler method to calculate the following: a) What is the entropy change (S), enthalphy change (H), and change in internal energy (U) of n-octane? (12 Marks) b) Calculate the heat that must be supplied to the system to maintain isothermal conditions. (4 Marks) c) Calculate the necessary amount of work. (4 Marks) Additional information: 1. Given Tc=543.90K,Pc=28.70 bar, and =0.326 2. The temperature of the initial and final states is the same, therefore, the terms involving Cigp drop out. 3. The volume is calculate as V=ZRT/P 4. The initial state is sufficiently close to the ideal gas state so that the residual properties could be taken to be zero. n-Octane is compressed reversibly at constant temperature along the critical isotherm until the critical point is reached. The initial pressure is 1 bar. The pressure takes place in a closed system. Use the Lee-Kesler method to calculate the following: a) What is the entropy change (S), enthalphy change (H), and change in internal energy (U) of n-octane? (12 Marks) b) Calculate the heat that must be supplied to the system to maintain isothermal conditions. (4 Marks) c) Calculate the necessary amount of work. (4 Marks) Additional information: 1. Given Tc=543.90K,Pc=28.70 bar, and =0.326 2. The temperature of the initial and final states is the same, therefore, the terms involving Cigp drop out. 3. The volume is calculate as V=ZRT/P 4. The initial state is sufficiently close to the ideal gas state so that the residual properties could be taken to be zero