Asolution is prepared by mixing 0.0295 mol of ch2cl2 and 0.0483 mol of ch2br2 at 25°c. assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25°c. at 25°c, the vapor pressures of pure ch2cl2 and pure ch2br2 are 133 and 11.4 torr, respectively.

)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.