Okay, if you have 1 kilomole of ice melting at 0 C and you have a given latent heat of fusion of ice as 3.348 x 10^5 J/kg and the density of ice as 917 kg/m^3 and te density of water as 999.9 kg/m^3, I don't understand how to find the work done. I know that work done is PdV, so it should be W=P(V2-V1). I understand that the volumes is the mass in kg of the water molecules over the densities of ice and water. But how do you solve P? P=nRT/V. so P = (1 kilomole)(8.314 x 10^3 j/kK)(273 K)/V. I don't really understand how to solve for V.