A sample of 0.1 g of water at 100^° C and normal pressure ( 1.013 × 10^5 Nm^-2 ) requires 54 cal of heat energy to convert to steam at 100^° C. If…

A sample of $\displaystyle 0.1 \mathrm{~g}$ of water at $\displaystyle 100^{\circ} \mathrm{C}$ and normal pressure ( $\displaystyle 1.013 \times 10^5 \mathrm{Nm}^{-2}$ ) requires $\displaystyle 54$ cal of heat energy to convert to steam at $\displaystyle 100^{\circ} \mathrm{C}$. If the volume of the steam produced is $\displaystyle 167.1 \mathrm{cc}$, the change in internal energy of the sample, is