Shown below is the phase diagram for a typical liquid mixture of two components, A and B 150 130--___- 110 70 50 100%-80%-60%--40%-20%--0% 0%-20%-40%-60%-80%-100% A B 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. O A boiling liquid with composition Y will produce a vapor with composition X. O 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 linc gives the difference. 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- Â°C Solution The point X gives the vapour composition of the less volatile components and y gives the vapour composition of more volatile components and boiling point of water is 100Â°c .