A two-phase mixture of water (nH2O=1 mole) and oxygen (nO2 = 2 moles) is confined in a piston-cylinder system at P=1 bar and T=298.15 K. The mole fraction of oxygen is 0.8 in the vapor phase and 0.1 in the liquid phase.
Calculate the total volume of the system. Assume all gases to be ideal. Vliq phase=18 cm3/mol
How many moles of water are needed to be added or removed from the system to convert it into a one phase system at the same pressure and temperature?