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Question 3 1 kg water vapor initially at 600°C and 400 kPa is contained in a rigid tank. The system is then allowed to cool. Determine the pressure at which the condensation first occurs. Also, calculate the fraction of the total mass that has condensed when the temperature reaches 90°С. Show the whole cooling process on a P-v diagram with respect to saturation lines. Calculate the amount of work involved during the entire cooling process. Question 4 A system contains 2 kg of carbon dioxide gas initially at state 1, where P1 = 1 bar and T1 = 300 K. The system undergoes a cycle that consists of three processes as described below: Process 1-2: constant volume to P2 = 4 bar Process 2-3: expansion with PV1.28 = constant Process 3-1: isobaric compression Sketch the three process that make up the cycle on a P-v diagram. Calculate the work for each of the process. Then, calculate the net work of the cycle.