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Vapour pressure of a solution of 5gof no...

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

A

60. 0

B

120. 0

C

180. 0

D

380. 0

Text Solution

Verified by Experts

The correct Answer is:
C
`(DeltaP)/P^(@)=chi_(B)= rArr (DeltaP)/P^(@)=chi_(B)=(5//Mw_(B))/(5//Mw_(B) + 100//18)`
`rArr Mw_(B)=179.28 g "mol"^(-1)`
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