Desiré was investigating a chemical reaction . When she heated it up , she found that sulfuric acid ( H2SO4 ) changed into water (H20) . She made the following atomic- scale model to show what she thinks happened . Do you think this is a complete model of what happened during the chemical reaction ?

)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.