An ideal gas at 6 MPa and 200°C is fl owing in a pipe, as shown in the following fi gure. 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 ideal gas until the pressure is 6 MPa, and then the valve is closed. Heat transfer occurs from the tank to the surroundings in the amount of 3.9325 kJ per each mol of gas that fl ows into the tank. The surroundings are at 25°C. The heat capacity is given by:

(a) Determine the fi nal temperature of the gas in the tank immediately after the valve is closed.
(b) Determine the entropy change of the universe for this process.

Transcribed Image Text:

where T' is in K. Ideal Gas 6MPa, 200C Tsurr = 25C Initially Vacuum CP R = 3.6 0.5 x 10-T