Question

3. Refer to the figure to answer a-e. (a) What are the boiling points of A and B? tB (b) What is the boiling point of a mixture that is 50% A? 150 130-_. 110 (c) What percent A is the vapor that leaves the liquid from (b)? 70 50 (d) Does the boiling liquid get richer in A or B? 60%-ー40%으 20%-一096 0%-20%-40%-60%-80%-100% A 100%-80% B (e) How does this change the boiling point?

Refer to the figure to answer a through E.

Answer 1

a) The boiling points can be found at 100% concentration of both A and B. So at 100% A, the temperature at which liquid change into vapour or the boiling point of A is t_A=90 (Units not given in graph)
Also at 100% B, the boiling point is t_B=170

b)At 50% A, the gaseous phase starts at the interface of liquid and the gas-liquid mixture i.e. T=110.

c)The wt% of A leaving as vapour according to b) can be found by drawing a parallel line which meets the interface of Vapour and Vapour-Liquid mixture, i.e. 90% A.

d)The boiling liuid always gets richer in B.

e) Because of it the boiling point keeps on increasing as with the increase in concentration of B, the temperature increases.