ical Chemistry LaB a) if the solution containing 0.8mol fraction of ethanol is h
ID: 1088097 • Letter: I
Question
ical Chemistry LaB a) if the solution containing 0.8mol fraction of ethanol is heat up in a closed vessel, at what temp it wi start to boil and what will be the composition of the first bubble of vapor to come off? 11.0 If the solution containing 0.8mol fraction of ethanol is heat up in a closed vessel, what is the composition of the vapor and the liquid phase at 740C? 11.0 b) c) If the solution containing 0.8mol fraction of ethanol is heat up in a closed vessel, what is the composition of the last drop of liquid to evaporate? 11.0 d) what is the reason for this kind of azeotrope 1.0Explanation / Answer
a) This solution comes under azeotropic mixture. boiling point of water is 1000c and ethanol is 78.40c. but the ethanol-water azeotropic mixture having 78.20c. the composition of this mixture is ethanol 95.63% and water 4.37%. the composition is same when the first bubble is come off.
b) At 740c , In vapour phase and liquid phase both are having same composition 95.63% and water 4.37%.
c) last drop of liquid is also having ethanol 95.63% ,water 4.37% composition.
d) when two or more liquid are in amixture, the mixture is completely distilled at certain temperature without changing the composition are called azeotropic mixtures. ethanol-water mixture belongs to positive azeotrope.it having minimum boiling piont and maximum vapour pressure. in this mixture by the addition of one liquid to another the bonds are week and eaisly dissiociated , hence vapour pressure is high.
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