Question: A pistoncylinder device contains 4 kg of argon at 250 kPa and 35C. During a quasi-equilibrium, isothermal expansion process, 15 kJ of boundary work is

A piston–cylinder device contains 4 kg of argon at 250 kPa and 35°C. During a quasi-equilibrium, isothermal expansion process, 15 kJ of boundary work is done by the system, and 3 kJ of paddle-wheel work is done on the system. Determine the heat transfer for this process.

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