A liquid mixture of 60 mol% n-hexane and 40 mol% n-heptane at 70°C and 850 torr

Question

A liquid mixture of 60 mol% n-hexane and 40 mol% n-heptane at 70°C and 850 torr is compressed isothermally. Based on this information answer the following:

a) Determine the bubble point pressure and the composition of the vapor in equilibrium with this mixture.

b) Determine the dew point pressure and the composition of the liquid in equilibrium with this mixture.

c) Which of the two species (n-hexane or n-heptane) is the more volatile in terms of values you have calculated in parts (a)-(b). Explain briefly.

d) Sketch a Pxy diagram for this binary system. Make sure to label both the axis (with units), the phases on the diagram, and identify the pressures at both ends of the plot (e.g., when mole fraction is equal to 0 and 1) to receive full credit.

Explanation / Answer

A liquid mixture of 60 mol% n-hexane and 40 mol% n-heptane at 70°C and 850 torr

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