Into a separatory funnel is poured 50 ml of ch3ch2br (bromoethane), a water-insoluble compound with a density of 1.460 g/ml, and 50 ml of water. the funnel is stoppered and the mixture is shaken vigorously. after standing, two layers separate. which substance is in which layer? explain.

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.