InterviewSolution
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InterviewSolution
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Two liquids X and Y form an ideal solution. The mixture has a vapour pressure of 400 mm at 300 K when mixed in the molar ratio 1:1. when mixed in the molar ratio of 1:2 at the same temperatre the vapour pressure of the mixture is 350 mm. The vapour pressure of the two pure liquids X and Y respectively areA. `250 mm, 550 mm`B. `350 mm, 450mm`C. `350mm, 700mm`D. `550 mm, 250mm` |
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Answer» In 1st case, `n_(X)=n_(Y)` `therefore x_(X)=0.5` and `x_(Y)=0.5` `therefore p_(s)=p_(X)^(@)x_(X)+p_(Y)^(@)x_(Y)` `400=0.5p^(@)Y=800` ….(i) In 2nd case, `n_(X)//n_(Y)=1//2` `therefore x_(X)=1//3` and `x_(Y)=2//3` `therefore 350=(1//3)p^(@)X +(2//3)p^(@)Y` Or `p^(@)X + 2p^(@)Y = 1050` ....(ii) From (i) and (ii) `p^(@)Y=250` and `p^(@)X=550` |
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