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Thermodynamics question! Please show all work and be legible :). If you could also please explain...

Thermodynamics question! Please show all work and be legible :). If you could also please explain why you are using the equations you are, that would be great. Thanks!

A sealed cylinder-piston device is filled with .03 kg of air. This air is at 27 deg Celcius and fills 100 liters. 5 kJ of heat is then added to the air and work is then done on an object at constant pressure by the piston until the end of the transfer (with the air now at 50 deg Celcius). What is the work done by the air on the object?  

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