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Y g of non-volatile organic substance of...

`Y g` of non-volatile organic substance of molecular mass `M` is dissolved in `250 g` benzene. Molal elevation constant of benzene is `K_(b)`. Elevation in its boiling point is given by:s

A

`M/(K_(b)Y)`

B

`(4K_(b)Y)/M`

C

`(K_(b)Y)/(4M)`

D

`(K_(b)Y)/M`

Text Solution

Verified by Experts

The correct Answer is:
b
`DeltaT_(b)=K_(b)xx(W_(B)xx1000)/(M_(B)xxW_(A))`
`=K_(b)xx((Y_(g))xx(1000 g ))/(Mxx(250g ))`
`(K_(b)xxYxx4)/M=(4K_(b)y)/M`
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