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 vapor at equilibrium. T, °C XM Ум 110.9 0.908 0.923 112.0 0.795 0.836 114.0 0.615 0.698 115.8 0.527 0.624 117.3 0.408 0.527 119.0 0.300 0.410 121.1 0.203 0.297 123.0 0.097 0.164 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 vapor in equilibrium with the liquid of composition (a) XM = 0.250 and (b) xo = 0.250?

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