What is the work done by the piston in the following system?

Posted on 2017-03-02 19:37:00 in Engineering by LIDDY

Basically, I have a horizontal, frictionless piston-and-cylinder device 

At the start there is 0.8 kg saturated liquid water and 0.2 kg saturated water vapour inside the piston-and-cylinder at 100°C 

CALCULATE: 

The work done by the piston when liquid water in the device is completely vaporized to saturated steam at 100°C 

Using this result, find the heat required for the vaporization of water 

* The work is done against the atmosphere 
** Use steam tables where appropriate

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