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[lolly]

A liquid mixture containing 25 mol% benzene and 75 mol % ethyl alcohol in which components are miscible in all proportions, is heated at a constant pressure of 1 atm from a temperature of 60 degrees celcius to 90 degrees celcius. Use the following T-X-Y experimental data, perform calculations to determine the answers to parts (a) through (f).
Experimental T-X-y data for benzene ethyl alcohol at 1 atm.
temperature ©
78.4 77.5 75 72.5 70 68.5 67.7 68.5 72.5 75 77.5 80.1
mole percent benzene in vapor:
0 7.5 28 42 54 60 68 73 82 88 95 100
mole percent benzene in liquid
0 1.5 5 12 22 31 68 81 91 95 98 100
a) At what temperature does vaporization begin?
Tbubble pt=69.5 C (from graph)
What is the composition of the first bubble of equilibrium vapor formed?
ybubble=55 (from graph)
c) What is the composition of the residual liquid when 25 mol% has evaporated? Assume that all vapor formed is retained within the apparatus and that it is completely mixed and in equilibrium with the residual liquid?
Vapor Fraction =25-x25/(y25-x25) solved for x25 and y25 using lever rule estimate
d) repeat part c for 90 mol% vaporized.
This is where I am confused. not sure how to use the lever rule here.

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