Match each definition to the appropriate term. The condition that a reaction takes place without outside help Choose... Sum of the internal energy plus the product of the pressure and volume for a reaction Choose... Solution in which no more solute can be dissolved in the solvent Choose... The extent of randomness in a system Choose... Difference of the enthalpy (of a system) minus the product of the entropy and absolute temperature Choose... CHECK

)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.