The following temperature–composition data were obtained for a mixture of octane (O) and methylbenzene (M) at 1.00 atm, where x is the mole fraction in the liquid and y the mole fraction in the vapour at equilibrium.

The boiling points are 110.6 °C and 125.6 °C for M and O, respectively. Plot the temperature–composition diagram for the mixture. What is the composition of the vapour in equilibrium with the liquid of composition (i) x_M =0.250 and (ii) x_O =0.250?  

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0/С 110.9 112.0 114.0 115.8 117.3 119.0 121.1 123.0 0.908 0.795 0.615 0.527 0.408 0.300 0.203 0.097 0.923 0.836 0.698 0.624 0.527 0.410 0.297 0.164 XM Ум