1. The problem statement, all variables and given/known data A closed, rigid tank contains 2kg of water initially at 80 degrees C and a quality of .6. Heat transfer occurs until the tank contains only saturated vapor at a higher pressure. Kinetic and potential energy effects are negligible. For the water as the system, determine the amount of energy transfer by heat, in kJ. 2. Relevant equations U = Q - W, W = 0 => U = Q mu = U pv = RT 3. The attempt at a solution I don't really know where to even begin. I know the volume is constant, and I assume that I need to find the specific internal energy for the water and water vapor at the initial and final temperatures. Given the initial temperature and knowing V is constant, I might be able to determine pressure? I can't figure out how I would find the temperature and pressure for the saturated water vapor state either.