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1 mole of liquid A and 9 moles of liquid...

1 mole of liquid A and 9 moles of liquid B are mixed to form a solution. If `"P"_("B")^(@)=400"mm"` of Hg and `"P"_("A")^(@)=20 "mm"` of Hg at a temperature 'T' and normal boiling point of liquid B is 300K then answer the questions that follow.
Given data: `"K"_("b")=2.7"K kg mol"^(-1),` Molar mass of B=100
If 'A' is perfectly non volatile and it dimerises to and extent of 60% then what will be the vapour pressure of the solution.

A

`360mm Hg`

B

`3600/9.7" mm Hg"`

C

`4000/9.7"mm Hg"`

D

`36mm Hg`

Text Solution

Verified by Experts

The correct Answer is:
B
`{:(2A,rightarrow,"A"_(2),),(1,,0,),(1-beta,,beta//2,),(beta=0.6=0.4,,0.3,"Total=0.7):}`
`"P"_("S")="P"^(@)xx"solvent"`
`=400xx9/(9+0.7)`
`"P"_("S")=3600/9.7"mm of Hg"`
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