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A solution of 7 g of a non-volatile solu...

A solution of 7 g of a non-volatile solute in 250 g of water boils at `100.26^(@)C`. Find the molecular mass of th solute `K_(b)` for water is 0..52 K kg `mol^(-1)` .

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The correct Answer is:
56 g `mol^(-1)`
Elevation in boiling point, `DeltaT_(b)=100.26-100=0.26^(@)C=0.26 K`
`M_(B)=(K_(B)xxW_(B))/(DeltaT_(b)xxW_(A))=((0.52" K kg mol"^(-1))xx(7g))/((0.26 K)xx(0.250" Kg"))=56" g mol"^(-1)`
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