`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.

Answer

(a)`-168.67 J,(b)2088.53 J`;