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Question

6g. of the area of dissolved in 90g. of boiling water. The vapour pressure of the solution is:

A
744.8 mm
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B
758 mm
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C
761 mm
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D
760 mm
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Solution

The correct option is A 744.8 mm
Vapour pressure P=P°x,P°=Boiling point of pure solvent
P=P°n1n1+n2

=760(0.10.1+5)90gH2O=5mol=n2;6g urea=0.1mol=n1

=760(0.10.1+5)

=760×0.0196=14.89 Torr=lowered pressure

Now, 1 torr = 1 mm of Hg

Vapour pressure of solution=76014.89744.8mm of Hg
Option A is correct.

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