[Squeak1107]

So this is more of a concept thing than a homework problem

In my lab today we were reacting phosphoric acid with cyclohexanol to make cyclohexane and water. Cyclohexane and water form an azeotrope with a mole fraction of 0.308 water. We did this reaction when distilling - I'm a bit confused by the idea of an azeotrope and mole fraction. Although i understand that the mixture can not be separated by distillation and they will both distill off in this case would I expect that the distillate contained 0.308 percentage moles of water? The result i actually got was much closer to 50% water (again in molar quantities). What does the mole fraction composition mean - all reading suggests that its the composition of the vapour but is it at all temperatures or have I got it completely wrong!

[AWK]

http://www.wikiwand.com/en/Mole_fraction