QUESTION 3 Using the vapour pressure data for the n-heptane and n-octane binary system provided in Table 1, calculate the molar fraction of the liquid phase, XA, at 110.0C. Using the vapour pressure data for the n-heptane and n-octane binary system provided in Table 1, calculate the molar fraction of the vapour phase, ya, at 120.0 C. Problem statement A mixture of 100 kmol containing 60 mol% n-heptane and 40 mol% n-octane is subjected to a differential distillation at atmospheric pressure, with 60 kmol of the liquid distilled. The boiling points of the pure components are 98.4 C for n-heptane and 125.6 C for n-octane, and their vapour pressures at 760 mmHg are given in Table 1. You should use this information to answer the questions on the Blackboard test. Table 1 Vapour pressure data for the n-heptane and n-octane binary system at 760 mmHg of pressure Temperature pn-heptane pon-octane (C) (mmHg) (mmHg) 98.4 760 333 105.0 940 417 110.0 1050 484 115.0 1200 561 120.0 1350 650 125.6 1540 760