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Shown below is the phase diagram for a typical liquid mixture of two components, A and B

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Shown below is the phase diagram for a typical liquid mixture of two components, A and B. Vapo 150 130 110 Liau 70 50 20%0% -80%--100% ? 1 00%-8090-6090-40 B 0%-20%-40%-60%

This questions has 2 parts (a and b):

a) What is the significance of the horizontal line between points X and Y?

- A boiling liquid with composition X will produce vapor with composition Y.

- The length of the line XY corresponds to the difference in boiling point of components A and B.

- The point X gives the vapor composition of the less volatile component and Y gives the vapor composition of the more volatile component. The line gives the difference.

- A boiling liquid with composition Y will produce a vapor with composition X.

b) Using the phase diagram, determine the molar composition of the vapor in equilibrium with a boiling liquid that has a composition of 50.% A and 50.% B.

- Percentage vapor composition A = ____%

- Percentage vapor composition B = ____%

- What is the boiling point of this liquid? Boiling point = _____°C