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The vapour pressure of an aqueous soluti...

The vapour pressure of an aqueous solutionof sucrose at 373 k is is found to 750 mm Hg. The molality of the solution at the same tempreature will be :

A

`0.64`

B

`0.741`

C

`0.68`

D

`0.94`

Text Solution

Verified by Experts

The correct Answer is:
B
`(P^(@)-P_(s))/(P_(s))=(W_(1)xxm_(2))/(m_(1)xxw_(2))`
`rArr (P^(@)-P_(s))/(P_(s))=((w_(1)xx1000))/((m_(1)xxw_(2)))xx(m_(2))/(1000)=mxx(m_(2))/(1000) " " (m_(1)`= mol. Wt. of solute)
`rArr (760-750)/(750)=mxx(18)/(1000)`
`:.m=(10xx1000)/(750xx18) =0.741` mol/ k of solvent
Hence, (B) is the correct answer.
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