A solution containing 8 g of a substance in 100 g of diethyl ether boils 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 kg mol ^(-1))

A solution containing 8 g of a substance in 100 g of diethyl ether boi

1.	A solution containing 8 g of a substance in 100 g of diethyl ether boils 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 kg mol ^(-1))
Answer» SOLUTION :We have, mass of SOLUTE,` W_(2)=8g` Mass of solvent, `W_(1) = 100 g ` Elevation of boiling point, `Delta T_(b) = 36.86 - 35.60=1.26 ^(@)C` `K_(b)=2.02` Molecular mass of the solute `M _(2) = ( 1000 xx W_(2) xx K _(b))/(Delta T_(b) xx W_(1))= (1000 xx 8 xx 2.02)/(1.26 xx 100) = (161.6)/(1.26)` `= 128.25 g mol ^(-1).`