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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.