final-201-10-sol

A sample of the vapor shows that its composition is

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Unformatted text preview: ssel contents? How many moles are there in the vapor phase? How much heat had to be added to the vessel contents (neglect that heat that goes to heating the vessel itself) to reach this condition? The Txy diagram on the following page is for the benzene-toluene system. SOLUTION The vapor composition must lie along the dew point curve of the Txy diagram as shown. Thus the liquid composition is xBenz = 0.23. This tie line corresponds to a temperature of 101°C. Applying the lever rule along the tie-line gives 100 0.30 0.42 0.368 0.23 0.23 36.8 To do this create an enthalpy input/output table as shown below Compound Benzene (l) Benzene (v) Toluene (l) Toluene (v) nin (moles) (kJ/mole) nout (moles) (kJ/mole) Initially all of the materials were liquid so the number of moles can be found from the problem statement. For the out side of the table take the composition times the number of moles in the vapor to get the moles of that component in the vapor and subtract this number from the total number of moles to get the moles in the liquid. Thus for benzene the number of moles in the vapor would be 0.42 (36.8) = 15.5 mole and the number of moles in the liquid would be 30 – 15.5 = 14.5 mole. This gives a table that looks like Compoun...
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