A rigid tank contains an ideal gas at 40°C that is being stirred by a paddle wheel.

Question:

A rigid tank contains an ideal gas at 40°C that is being stirred by a paddle wheel. The paddle wheel does 200 kJ of work on the ideal gas. It is observed that the temperature of the ideal gas remains constant during this process as a result of heat transfer between the system and the surroundings at 30°C. Determine the entropy change of the ideal gas.

A rigid tank contains an ideal gas at 40°C that