Two volatile liquids A (P A pure= 165 Torr) and B (PB pure= 85.1 Torr) are confined in a piston/cylinder assembly. Initially only the liquid phase is present. As the external pressure is reduced, vapor is first observed at a total pressure of 110 Torr. Calculate the mole fraction of component A in the solution (XA) and the mole fraction of component A in the vapor (YA).

Explanation:

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In this case, one could use the following equations to compute the required mole fractions (fugacity equality for both A and B):

Therefore, the 2x2 system of equations turns out:

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