Identify the observations that indicate an added solute is insoluble in water. Select one or more: a. The addition of the solute to water causes the combination to feel warm when mixed.

b. The added solid settles to the bottom after mixing and allowing to settle.

c. The solute and water appear uniformly clear after mixing and allowing to settle.

d. A clear line appears between the added liquid and water after mixing and allowing to settle.

e. The combination of the solute and water appears cloudy after mixing and allowing to settle.

)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.