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1g of water changes from liquid to vapou...

`1g` of water changes from liquid to vapour phase at constant pressure of `1` atmosphere, the volume increases from `1 mL` to `1671 mL`. The heat of vaporisation at this pressure is `540 cal//g`. Find the:
(a) Work done (in `J`)during phase change.
(b) Increase in internal energy of water.

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