Which of the following statements about the composition of the vapour over an ideal 1 : 1 molar mixture of benzene and toluene is correct? Assume that the temperature is constant at ${25}^{\mathrm{o}}\mathrm{C}$ . (Given vapour pressure data at ${25}^{\mathrm{o}}\mathrm{C}$ , benzene = 12.8 kPa, toluene = 3.85 kPa)