Steam at 6 MPa and 400°C is fl owing in a pipe. Connected to this pipe through a valve is a tank of volume 0.4 m3. This tank initially is at vacuum. The valve is opened, and the tank fi lls with the steam until the pressure is 6 MPa, and then the valve is closed. Heat transfer occurs from the tank to the environment in the amount of 95 kJ per each kg of gas that fl ows into the tank. The environment is at 25°C.

(a) Determine the fi nal temperature of the steam in the tank immediately after the valve is closed.

(b) Determine the entropy change of the universe for this process.

(c) Determine the lost work during this process.