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Question A2 a. 5kg of saturated liquid water is at 270°C. What is its pressure? If the water was heated until it was completely converted into saturated vapour, calculate the change in volume and energy required. (40%) Answer: 0.172 m), 8026 kJ b. Define the critical point of water and show where this lies on a temperature vs. specific volume diagram. (30%) Answer: The critical point is the point at which the saturated liquid and vapour states are identical. For water this happens at a pressure of 22.06 MPa. [show on a T-v or P-v diagram] C. A rigid tank with a volume of 6.69 m² contains 15kg of saturated liquid-vapour mixture of water at 90°C. Now the water in the tank is slowly heated. Determine the temperature at which the liquid in the tank is completely vapourised. (30%) Answer: 145°C