Q.

For an ideal binary liquid solution with PA∘>PB∘, which relation between XA (mole fraction of A in liquid phase) and YA (mo1e fraction of A in vapour phase) is correct ?

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answer is 3.

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Detailed Solution

yA=PA∘×xAPA′xA+PB∘xB=xAxA+xBPB∘PA∘∵PA0>PB0 ∴yAxA=1xA+xBPBePA∘>⊥⇒yA>xA         ...(1) similarly,yB=PB∘×BPA∘xA+PB∘xB=xBxB+xAPA∘PB∘    ....(2) ∴ yB
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For an ideal binary liquid solution with PA∘>PB∘, which relation between XA (mole fraction of A in liquid phase) and YA (mo1e fraction of A in vapour phase) is correct ?