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What is the vapour pressure of the solut...

What is the vapour pressure of the solution containting 34.2g of sucrose per 100g of water at `25^(@)C` ? The vapour pressure of water at `25^(@)C` is 23.75 mm.

A

20.3 mm

B

23.10 mm

C

unpredictable

D

23.33 mm

Text Solution

Verified by Experts

The correct Answer is:
D
`n_(A)=(w_(A))/(m_(A))=(100)/(18)=5.55`
`n_(B)=(34.2)/(342)=0.1`
`x_(A)=(5.55)/(5.55+0.1)=(5.55)/(5.65)=0.982`
`p=p_(0)x_(A)`
`=23.75xx0.982=23.33` mm]
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