One kg of steam in a piston/cylinder device undergoes the following changes of state. Calculate Q and

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One kg of steam in a piston/cylinder device undergoes the following changes of state. Calculate Q and W for each step.

(a) Initially at 350 kPa and 250°C, it is cooled at constant pressure to 150°C.

(b) Initially at 350 kPa and 250°C, it is cooled at constant volume to 150°C.

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