1. The problem statement, all variables and given/known data A frictionless piston cylinder device contains a saturated liquid-vapor mixture at 100 °C. During a constant pressure process 600 kJ of heat is transferred to the surroundings which is at 25°C. As a result, part of the water vapor contained in the cylinder condenses. 2. Relevant equations Q-Wb = mΔu 3. The attempt at a solution If I wanted to find out the properties of the water how can I do so if they only gave me 1 intensive property, and I don't know how to use the first law since there is boundary work (?) that I can't figure out how much since ΔV is unknown.