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The vapour pressure of water at 20^(@)C ...

The vapour pressure of water at `20^(@)C is 17.54mm`. When 20g of non - ionic substance is dissolved in 100g of water, the vapour pressure is lowered by `0.30mm`. What is the molecular mass of the substance ?

A

210.2

B

206.88

C

215.2

D

200.8

Text Solution

Verified by Experts

The correct Answer is:
A
`M_(B)=(W_(B )xx M_(A) xxP^(0))/( W_(A) ( P^(0) -P))`
`= ( 2 0 xx 18 xx 17.54 )/( 100 xx 0.3) ~~210`
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