plz answer quickly!!!!

Asked by  | 9th Apr, 2008, 12:59: AM

Expert Answer:

Dear Student,

Let:

pA = Vapour pressure of benzene=500 mm Hg

n= mole fraction of benzene

pB = Vapour pressure of toluene= 200 mm Hg

pt  = Total pressure  = 380 mm Hg

Using raoult's law for ideal solutions we have:

pA n   +   pB (1-n) = pt

or

500 n + 200 (1-n) = 380

or

300 n = 180

or

n=0.6

Hence mole fraction of Benzene in the mixture is 0.6.

Answered by  | 13th Jun, 2008, 12:41: PM

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