A sample of 0.1 g of water at ${100}^{0}C$ and normal pressure$\left(1.013\times {10}^5 \mathrm{N}{ \mathrm{m}}^{-2}\right)$  requires 54 cal of heat energy to convert to steam at ${100}^{0}C$. If the volume of the steam produced is 167.1 cc , the change in internal energy of the sample is