In a phase diagram, how do I know which line represents A and which line Represe

Question

In a phase diagram, how do I know which line represents A and which line Represent B if I wanted to find the normal boiling point of A or B?

For Example:

A phase diagram for a solution of A and B (at a fixed pressure of 1.00 atm) is given below. Based on the phase diagram, answer the following questions. Describe what happens when a closed system at an initial temperature Ti = 60. degreeC and an initial mole fraction ZA = 0.400 is heated at a constant pressure p = 1.00 atm. What is the normal boiling point for A and the normal boiling point for B? Do A and B form an azcotropc? If so, give the location (temperature and mole fraction) for the azcotropic mixture. Is the azcotrope a high boiling or a low boiling azcotrope? Consider a system with 1.000 moles of substancc, and a mole fraction of A in the system ZA = 0.400. At T = 80.0 degreeC, points a, b, and c arc located at 0.284, 0.400, and 0.656, respectively. Find the total number of moles in the liquid phase and the total number of moles in the vapor phase. A phase diagram for a solution of A and B (at a fixed pressure of 1.00 atm) is given below. Based on the phase diagram, answer the following questions. Describe what happens when a closed system at an initial temperature Ti = 80. degreeC and an initial mole fraction ZA = 0.400 is heated at constant pressure p = 1.00 atm. What is the normal boiling point for A and the normal boiling point for B? Do A and B form an azcotropc? If so, give the location (temperature and mole fraction) for the azeotropic mixture. Is the azcotropc a high boiling or a low boiling azcotrope. What arc the mole fraction of A in the liquid phase and the mole fraction of A in the vapor phase for a system with Za = 0.400 and at a temperature T = 95.0 degreeC? Consider distillation of a mixture with a mole fraction of ZA = 0.400. Vapor is continuously removed by condensation during the distillation. When does the mixture first boil? What is the initial value for the mole fraction of A in the liquid phase and the vapor phase when the mixture first boils? How do the boiling temperature, the mole fraction of A in the liquid phase, and the mole fraction of A in the vapor phase, change as the distillation proceeds? Is it possible to obtain pure A by distillation from a mixture with an initial mole fraction Za = 0.400? Why or why not?

Explanation / Answer

The left most part on X-axis is of "A" Phase and the right most is of "B" phase. The part between them is mixture of A&B phases. For boiling point of 'A' note the temperature at left most point of X-axis. For boiling point of 'B' note the temperature at right most point of X-axis.

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