Chemical Forums
Specialty Chemistry Forums => Chemical Engineering Forum => Topic started by: kankerfist on October 05, 2007, 03:51:11 PM
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I have a Txy diagram of Benzene and Toluene that shows the mole fraction of Benzene in the liquid phase and vapor phase for a range of temperatures at 1 atm. I've been given the following information:
a system containing a 50 mole liquid mixture of 15 mole% benzene and 85 mole % toluene is initially 25 degrees Celsius and 1 atm. The mixture is heated at constant pressure until it is 106 degrees Celsius and allowed to equilibrate.
I can see from my Txy diagram that when the temperature is 106 degrees Celsius, then:
Vapor is 25 mole% Benzene and 75 mole% Toluene
Liquid is 10 mole % Benzene and 90 mole% Toluene
What I am unsure about is how to use the diagram to also determine how many moles remain liquid after equilibrium. I found the mole fraction in the remaining liquid, but that's all. I know how to find it using Raoult's law and a physical property table, but I was wondering if there was a quicker way to find out just by using the Txy diagram. If it's possible, any tips would be appreciated! I need to learn as many time savers as possible for my upcoming test.