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A solution containing 8 g of substances in 100 g of diethyl ether bolis at `36.86^(@)C`, whereas pure ether boils at `35.60^(@)C`. Determine the molecular mass of the solute. (For ether `K_(b)2.02 K g "mol"^(-1))`

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We have, mass of solute, `w_(2)=8g`
mass of sovlent, `w_(1)=100g`
`:.` Molecular mass of the solute
`M_(2)=(1000xxw_(2)xxK_(b))/(DeltaTbxxw_(1))`
`=(1000xx8xx2.02)/(1.26xx100)=(161.6)/(1.26)=128.25g "mol"^(-1)`

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