1 g of water at 100^° C is converted into steam at the same temperature and at 1 atmospheric pressure. The change in internal energy is \ \ \ \ J.…

$\displaystyle 1$ g of water at $\displaystyle 100^{\circ} \mathrm{C}$ is converted into steam at the same temperature and at $\displaystyle 1$ atmospheric pressure. The change in internal energy is \_\_\_\_J. [Consider latent heat of vaporisation is $\displaystyle 2256 \mathrm{~J} / \mathrm{g}$ and $\displaystyle 1 \mathrm{~atm}=10^5 \mathrm{~Pa}$ ] [Volume of water and steam at $\displaystyle 1 \mathrm{~atm}=1 \mathrm{~cm}^3$ and $\displaystyle 1671 \mathrm{~cm}^3$ respectively]