1. The problem statement, all variables and given/known data Problem shown in attach picture A cylinder of total internal volume 0.10 m3 has a frictionless internal piston (of negligible mass and thickness) which separates 0.50 kg of water below the piston from air above it. Initially the water exists as saturated liquid at 120°C and the air, also at 120°C, exerts a pressure such that it exactly balances the upward force exerted by the water. (refer to the figure right). heat is then transferred into the entire cylinder, such that the two substances are at the same temperature at any instant, until a final State 2 having a uniform temperature of 180°C is reached. The air may be assumed to behave ideally, having R = 0.287 kJ kg-1 K-1; cp0 = 1.004 kJ kg-1 K-1; cv0 = 0.717 kJ kg-1 K-1. (a) What is the mass of air in the cylinder? (b) Determine both the volume below the piston, and the dryness fraction of the water occupying that volume when State 2 is reached. (c) What is the change in the total internal energy of: (i) the air; and (ii) the water during the entire heat addition process from State 1 to State 2. (d) How much heat has been transferred into the complete system comprising both water and air? 2. Relevant equations I really have no idea, I was trying with pV=mRT 3. The attempt at a solution Im totally stuned by this question, I tried doing pV=mRT but that was wrong the a) is 0.175kg. COuld someone please help me how I could start going through this problem?