Question: 3 . ( 1 ) Air at ( 2 5 7 ^ { circ } mathrm { C } ) and

3.(1) Air at \(257^{\circ}\mathrm{C}\) and 400 kPa is contained in a piston-cylinder device. The air expands adiabatically until the pressure is 100 kPa . Determine the mass of air needed to produce a maximum work of 1000 kJ . Assume air has constant specific heat evaluated at 300 K .
3 . ( 1 ) Air at \ ( 2 5 7 ^ { \ circ } \ mathrm

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