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The vapour pressure of a solution of 5g ...

The vapour pressure of a solution of 5g of non-electrolyte in 100g of water at a particular temperature is `2985 N m^(-2)`. The vapour pressure of pure water at that temperature is `3000 N m^(-2)`. The molecular weight of the solute is

A

`180`

B

`90`

C

`270`

D

`200`

Text Solution

Verified by Experts

The correct Answer is:
a
`(P_(A)^(@)-P_(S))/P_(S)=W_(B)/M_(B)xxM_(A)/W_(A)`
`(3000-2985)/(2985)=((5g))/((M_(B)))xx((18g))/((100g))`
`M_(B)=180 (by calculation)`
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