900 70°C 700 500 300 0.2 0.4 0.6 0.8 1 Mole fraction of hexane, z, 100 90 80 70 (760 Torr 60 0.2 0.4 0.6 0.8 1 Mole fraction of hexane, z4 Figure 5.2 Phase diagrams of the solutions discussed in Problem P5C.5. Temperature, 01°C Pressure, p/Torr
Figure 5.2 shows the experimentally determined phase diagrams for the nearly ideal solution of hexane and heptane. (a) Indicate which phases are present in each region of the diagram. (b) For a solution containing 1 mol each of hexane and heptane molecules, estimate the vapour pressure at 70 °C when vaporization on reduction of the external pressure just begins. (c) What is the vapour pressure of the solution at 70 °C when just one drop of liquid remains? (d) Estimate from the figures the mole fraction of hexane in the liquid and vapour phases for the conditions of part b. (e) What are the mole fractions for the conditions of part c? (f) At 85 °C and 760 Torr, what are the amounts of substance in the liquid and vapour phases when zheptane = 0.40?
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