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Superheated steam at 0.10MPa and 300C inside a cylinder of volume 3.0 liters drives a piston...

Superheated steam at 0.10MPa and 300C inside a cylinder of volume 3.0 liters drives a piston in a steam locomotive cylinder. It expands isobarically. By what multiple can the volume grow before the system becomes a saturated liquid-gas mixture? At this point, how much boundary work will have been done on the piston?

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