b. What is the mole fraction of benzene in the vapor above the solution? 2. Use

Question

b. What is the mole fraction of benzene in the vapor above the solution? 2. Use the diagram below to answer the questions that follow. 70 Vapor 50 %Hexane %Pentane 100 20 80 40 60 60 40 100 0 20 Composition (mole %) a) (3 pt) Which letter best represents the boiling point of hexane? (3 pt) Which letter best represents the percent composition of the vapor phase above a boiling solution that is made up of 80% hexane and 20% pentane? b) e) (3 pt) Which letter best represents the percent composition of the distillate after one theoretical plate when starting with a solution that is 80% hexane and 20% pentane?

Explanation / Answer

a)

boiling point of hexane, is when hexane = 100%

therefore, go to the right side,

at this point, go to the tempareutre max, which is T boili for hexane

"F" is the boiling point of hexane

b)

above boiling solution of 80% hexane

in the x-axis, go to 80% of hexane, then go to E and D

clearly, vapor phase is on the top, so ignore D, this must be E

c)

the destillate --> 1 theoretical plate from this points

this is reuiqred:

From E --> go to bottom "D"

then, form D go horizontally to "C"

this is the point of mixture of 1 stage

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