Expansion Problem

One kilogram of liquid water at 100°C is vaporized to steam at 100°C in a piston. (Equilibrium can be assumed). What procedure is needed to determine how much heat would be required and how much work is done in this process? If Q does not equal W, what accounts for the difference?

Work (to 3 sig figs): kJ
Heat (to 3 sig figs): kJ

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