A rigid tank contains an ideal gas at 40°C that is being stirred by a paddle wheel. The paddle wheel does 170 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. Heat Ideal gas 40°C 30°C The entropy change of the ideal gas is KJ/K.