SOLUTION: An ideal gas is in contact with a heat reservoir so that it remains at constant temperature. A 1.9 kg mass placed on the piston causes the piston to drop by 24.0 cm. How much heat

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Question 1130921: An ideal gas is in contact with a heat reservoir so that it remains at constant temperature. A 1.9 kg mass placed on the piston causes the piston to drop by 24.0 cm. How much heat (in J) flows from the ideal gas to the reservoir?
Answer by ikleyn(52817) About Me  (Show Source):
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Since linear dimensions are not given, it means that the change of internal energy of the gas due to the pressure and volume change 

are not considered (are negligible). 


Then the change of mechanical energy of the system is  delta(P) = mgh = 1.9 kg * 9.81 m/s^2 * 0.24 m = 4.473 joules.


This amount of energy transforms to the heat energy and goes from the ideal gas to the heat reservoir.


Answer.  4.473 joules of heat energy go from the ideal gas to the heat reservoir.