A liquid mixture containing 50 mol% benzene and 50 mol% toluene at 1 atm is heated isobarically in a closed container from an initial temperature of 70˚C. Use the diagrams provided here for binary benzene/toluene mixtures to answer the following questions: i) At what temperature does the first bubble form? What is the composition of benzene in this bubble? ii) At one point during the process the system temperature is 95˚C. Estimate the mole fractions of benzene in the vapor and liquid phases at this point. What would be the relative fraction of vapor to liquid (V/L)? iii) At what temperature does the last drop vaporize? What is the approximate composition of this last drop? iv) In another container, a mixture of overall composition 60 mol% toluene and 40 mol% cyclohexane at 100˚C and 1 atm splits into two phases. If the saturation pressure of cyclohexane at this temperature is 1300 mmHg, what are the mole fractions of toluene in the liquid and vapor phases at equilibrium?
A liquid mixture containing 50 mol%
benzene and 50 mol% toluene at 1 atm
is heated isobarically in a closed
container from an initial temperature
of 70˚C. Use the diagrams provided
here for binary benzene/toluene
mixtures to answer the following
questions:
i) At what temperature does the first
bubble form? What is the
composition of benzene in this bubble?
ii) At one point during the process the system temperature is 95˚C. Estimate the mole fractions of
benzene in the vapor and liquid phases at this point. What would be the relative fraction of vapor
to liquid (V/L)?
iii) At what temperature does the last drop vaporize? What is the approximate composition of
this last drop?
iv) In another container, a mixture of overall composition 60 mol% toluene and 40 mol%
cyclohexane at 100˚C and 1 atm splits into two phases. If the saturation pressure of cyclohexane
at this temperature is 1300 mmHg, what are the mole fractions of toluene in the liquid and vapor
phases at equilibrium?
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