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The relative lowering of vapour pressure...

The relative lowering of vapour pressure of an aqueous solution containing a non volatile solute is 0.125. What is the molality of this solution?

A

`7 93`

B

`6. 93`

C

`5. 93`

D

`4. 93`

Text Solution

Verified by Experts

The correct Answer is:
A
`( Delta P )/( P ^(@)) = X _("solute") = (1)/(8)`
If solute has x moles, then water has 7x moles.
`therefore ` Molality `= (x )/( 7x xx 18) xx 1000 = 7. 93 m`
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