55. Solving a chemistry problem

162. Based on the given data, construct a boiling diagram for a solution of propyl alcohol (С3Н8О) in water in the coordinates "temperature - composition" at p = const.

Composition of liquid solution (С3Н8О), % 0 20 40 60 80 90 100
Solution boiling point, tºС 100.0 95.0 90.8 87.7 89.2 91.5 97.8
Composition of condensate (first portion of steam) (С3Н8О), % 0 40 57 64 70 75 100

According to the boiling diagram, having made the appropriate constructions, determine:
1. At what temperature will a liquid containing 70% water boil? What is the composition of the equilibrium vapor?
2. What component will the steam be enriched with?
3. How will the composition of the liquid phase change during the boiling of a liquid of a given composition, and what is the limiting composition of the liquid phase?
4. What will be the composition of the liquid phase (residue) and condensate during the distillation of a solution of propyl alcohol in water of a given composition under optimal conditions?
5. What is the composition and boiling point of an azeotropic mixture of water and propyl alcohol?