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))`

Answer

`128.25 g mol^(-1)`

Explanation

`Delta T_(b) = 36.86 - 35.60 = 1.26^(@)C, K_(b) = 2.02 K m^(-1)`
`M_(B) = (2.02 xx 8 xx 1000)/(1.26 xx 100) = 128.25`