A partition separates the two compartments of a vessel. The vessel is submerged in a constant temperature bath at 200C. Compartment A contains 2.00 kg of water at 200C, 50.00 bar and compartment B contains 0.983 kg of water at 200C, 1.00 bar. The partition is removed and the water in both compartments fills up the entire vessel. Determine the final pressure, and the heat transfer that results from the mixing process, if the final temperature is 200C. I'm working on a practice test for my thermoclass, and I've been stuck on this problem for a while... What i've tried so far... Since this is water, I assumed that you could use density and just say that the volume of the compartments A and B are 2 m^3 and .983 m^3 respectively. I first assumed that it would have something to do with work, but W = PV isn't valid here because this isn't a gas. I'm trying Enthalpy changes, but i'm not given an internal energy for the equation H = U + PV. I am however given several charts, Saturated Steam Tables for temperature and pressure, and a table of Superheated Steam properties. So I guess I don't really know how to start finding the Pressure. Any hints to lead me to that?