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Shown below is the phase diagram for a typical liquid mixture of two components, A and B
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
Expert Solution
(a) A horizontal line XY represents -
A boiling liquid with composition X will produce vapor with composition Y . (Answer)
Explanation :below the lower curve system will be in liquid state and above the upper curve system will be in vapour state. Between the two curve, system will have liquid and vapour. If horizontal line cut at upper curve at point Y, it will give composition of vapor and at lower curve at point X, it will give composition of boiling liquid.
(b)
A 50% A and 50%B composition boiling liquid has horizontal line cut the upper curve at point V as shown in the figure. Composition of vapor at point V represents 90% A and 10%B composition.
Percentage vapor composition A = 90%
Percentage vapor composition B = 10%
Boiling point = 110 ?
Approximate diagram is shown below:
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