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Air in a piston-cylinder device undergoes an isobaric expansion process from 280 K and 245 kPa...

Air in a piston-cylinder device undergoes an isobaric expansion process from 280 K and 245 kPa to 880 K. This is achieved by adding heat to the system under quasi-equilibrium conditions. What is the work done by the air during this process? (Use the appropriate sign convention.) What is the amount of heat transferred for this process? (Use the appropriate sign convention.) Considering the actual variation in the specific heat of air during the process, what is the change in entropy of the air per unit mass? Given that the environment surrounding the piston-cylinder is at 1160 K, how much entropy is generated from this process?

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