At 298K, the vapour pressure of pure benzene, ${\mathrm{C}}_6{\mathrm{H}}_6$ is 0.256bar and the vapour pressure of pure toluene, ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{CH}}_3$ is 0.0925 bar. Two mixtures were prepared as follows:

(I) 7.8g of ${\mathrm{C}}_6{\mathrm{H}}_6$+9.2g of ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{CH}}_3$

(II) 3.9g of ${\mathrm{C}}_6{\mathrm{H}}_6$ + 13.8g of ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{CH}}_3$