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QUESTION 2 (25 MARKS] a) A 2 m rigid tank contains a saturated water vapor at 400 kPa. As a result of ? heat transfer from the water, the pressure in the tank drops to 300 kPa. Calculate the amount of heat transferred per unit mass. (9 Marks) b) A rigid tank (0.1 m) is filled with liquid Refrigerant-134a (R-134a) at 20C. A valve at the bottom of the tank is opened and the (R-134a) is withdrawn from the tank until three-quarters of the total mass leave the tank. At the same time, heat is transferred to maintain the temperature in the tank. Perform energy analysis for the rigid tank. (16 Marks)