Achef makes a marinade by mixing red pepper flakes, dried onion flakes, and ground ginger with soy sauce. he sets the marinade on the counter for a few minutes. when he returns, he must stir the marinade because the spices have settled to the bottom of the container.

)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.