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2 moles each of liquids A and B are diss...

2 moles each of liquids A and B are dissolved to form an ideal solution. What will be the mole fraction of B in the vapour phases ?
`p_(A)^(@) = 120 " torr ", p_(B)^(@) = 80` torr

A

`1//4`

B

`1//2`

C

`3//5`

D

`2//5`

Text Solution

Verified by Experts

The correct Answer is:
D
`Delta T = K_(f) xx (w_(B) xx 1000)/(m_(B) xx w_(A))`
`9.3 = 1.86 xx (50 xx 1000)/(62 xx w_(A))`
`w_(A) = 161.29 g` (amount of water present at `- 9.3^(@)C`)
`:.` Amount of ice separated `= 200 - 161.29 = 38.71 g`
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