4. A piston-cylinder at 120°C and 4.0 bar contains 1.50 mol of benzene (Pesat = 3.0

bar) and 0.5 mol of water (Pwat = 2.0 bar). Water and benzene are immiscible.

What happens when 1.7 mol of an ionic liquid (P₁Lsat = 0) are added at constant

temperature and pressure? The ionic liquid is soluble in water and forms an ideal

solution, but it is immiscible with benzene.