Question: A saturated water vapour is contained in a cylindrical vessel under a weightless piston at a temperature t = 100 C. As a result of

A saturated water vapour is contained in a cylindrical vessel under a weightless piston at a temperature t = 100 °C. As a result of a slow introduction of the piston a small fraction of the vapour Δm = 0.70 g gets condensed. What amount of work was performed over the gas? The vapour is assumed to be ideal the volume of the liquid is to be neglected.

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