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An aqueous solution containing 28% by ma...

An aqueous solution containing 28% by mass of a liquid A (mol. mass = 140) has a vapour pressure of 160 mm at `37^@C` . Find the vapour pressure of the pure liquid A. (The vapour pressure of water at `37^@C` is 150 mm.)

Text Solution

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`P_("sol")=P_A^0chi_A+P_B^0chi_B`
`rArr 160 =P_A^0chi_A+150(1-chi_A)`
`chi_A=(28//140)/(28//140+72//18)=0.0476 rArr P_A^0= 360.14 mm Hg`
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