Thermodynamics Part 4

1‌kg of water at 100∘C is converted into steam at 100∘C by boiling at atmospheric pressure. The volume of water changes from 1.00×10−3m3 as a liquid to 1.671m3 as steam. The change in internal energy of the system during the process will be
(Given latent heat of vaporisation =2257‌kJ∕kg, Atmospheric pressure =1×105‌Pa )