A horizontal cylinder equipped with a frictionless piston contains 785 cm3 of steam at 400 K and 125 kPa . A total of 83.8 joules of heat is transferred to the steam, causing the steam temperature to rise and the cylinder volume to increase. A constant restraining force is maintained on the piston throughout the expansion, so that the pressure exerted by the piston on the steam remains constant at 125 kPa. (a) Taking the steam as the system, show that Q = ∆U for this process. Then find that the final steam temperature. (b) Calculate the final cylinder volume, the work and the change in internal energy.

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