Question 3

a. A mass of 5 kg of saturated water vapour at 100 kPa is heated at constant pressure until the temperature reaches 200 °C. Calculate the work done by the steam during this process. (3 marks)

b. Define compressibility factor and the principle of corresponding states. (2 marks)

c. A rigid tank contains water vapor at 250 °C and an unknown pressure. When the tank is cooled to 200 °C, the vapor starts condensing. Estimate the initial pressure in the tank. (3 marks)