Consider the melting of 100 gms of ice at 273 K and 1 atm. of pressure. The densities of ice and water under these conditions are, respectively, 0.92 gms/cc and 1.0 gms/cc. The latent heat of fusion of ice is 80 cal/gm. Apply the first law to determine the heat absorbed, the work done, and the change in intermal energy. Do you expect the internal energy per unit mass of water to be greater or lesser than that of ice, and why?