Home
Class 12
CHEMISTRY
A solution containing 0.2563 g of naphth...

A solution containing `0.2563 g` of naphthalene (molecular mass = 128) in `50 g` of carbon tetrachloride yields a boling point elevation of `0.201^(@)C` while a solution of `0.6216 g` of an unknown solute in the same mass of the solvent gives a boiiling point elevation of `0.647^(@)C`. Find the molecular mass of unknown solute.

Text Solution

Verified by Experts

We know that
`K_(b) = (DeltaT_(b) xx W_(1) xx Mw_(2))/(1000 xx W_(2))`
For `C Cl_(4) , K_(b) = (0.201 xx 50 xx 128) /(1000 xx 0.2563) = 5.019`
`Mw_(2) = (1000 xx K_(b) xx W_(2)) / ((DeltaT_(b) xx W_(1))`
`=(1000 xx 5.019 xx 0.6216) /(0.647 xx 50)`
`= 96.44`
Promotional Banner

Similar Questions

Explore conceptually related problems

A solution containing 12.5 g of non-electrolyte solution in 175g of water gave a boiling point elevation of 0.7 k. calculate the molar mass of the solute if K_(b) for water is 0.52 K kg mol^(-1) .

0.6g of a solute is dissolved in 0.1 litre of a solvent which develops an osmotic pressure of 1.23 at m at 27^(@)C .The molecular mass of the substance is

A solution containg 12 g of a non-electrolyte substance in 52 g of water gave boiling point elevation of 0.40 K . Calculate the molar mass of the substance. (K_(b) for water = 0.52 K kg mol^(-1))

An aqueous solution containing one gram of urea boils at 100.30^(@)C . The aqueous solution containing 3.0 g of glucose in the same volume will boil at

If for a sucrose, elevation in boiling point is 1.0^(@)C , then what will be the boiling point of NaCl solution for same molal concentration?

Calculate the molality of an aqueous solution containing 3.0g of urea (mol.mass=60) in 250g of water.

A solution containing 4 g of a non-volatile organic solute per 100 mL was found to have an osmotic pressure equal to 500 cm of mercury at 27^(@)C . The molecular weight of solute is