In a fixed volume container of 0.1 m3, initially there is saturated water vapor at 130 oC. The vessel is connected to a pipe through which steam flows through a valve at 2 MPa pressure and 350 oC temperature. Then the valve opens and steam enters the container. Meanwhile, the temperature of the steam in the container remains constant at 130 oC due to the heat transfer to the environment. When it is observed that 3/4 of the water in the container covers the liquid phase by mass, the valve is closed. www ww www www w ww www w a) Calculate the final pressure in the container. b) calculate the mass of steam entering the container. c) Calculate the heat transfer to the environment.

A rigid tank of volume 2.5 m3 contains 15 kg of moist water vapor at 75°C. The water is then slowly heated. Determine the temperature at which the liquid, which is part of the wet vapor, in the tank evaporates completely. Determine the change in internal energy of the system. Also describe the process on a T-V diagram with respect to the saturation lines.

A 752-cm sample of water was placed in a 1.00-kg aluminum pan. The inital temperature of the pan was 26°C and the final temperature of the system was 39°C. What was the initial temperature of the water?

A spherical elastic balloon initially containing 5 kg of ammonia as saturated vapor at 20°C is connected by a valve to a 3-m³ evacuated tank. The balloon is made such that the pressure inside is proportional to the diameter. The valve is now opened, al- lowing ammonia to flow into the tank until the pressure in the balloon has dropped to 600 kPa, at which point the valve is closed. The final temperature in both the bal- loon and the tank is 20°C. Determine a. The final pressure in the tank b. The work done by the ammonia in the process