Addition of 0.643 g of compound to 50 ml of liquid (density 0.879 g/ml) lowers the freezing point from `5.51^@C` to `5.03^@C`. Calculate the molar mass of the compound. [`K_f` for benzene =5.12 K Kg `mol^(-1)`]

Addition of 0.40 g of a compound to 45.5 m L of benzene (density 0.879 g mL^(-1) ) lowers the freezing point from 5.51^(@)C to 4.998^(@)C .If K_(f) for benzene is 5.12 K kg mol^(-1) ,calculate the molar mass of the compound.

On dissolving 0.25 g of a non-volatile substance in 30 mL benzene (density 0.8 g mL^(-1)) , its freezing point decreases by 0.25^(@)C . Calculate the molecular mass of non-volatile substance (K_(f) = 5.1 K kg mol^(-1)) .

The boiling point of benzene is 353.23 K . When 1.80 g of a non-volatile solute was dissolved in 90 g benzene, the boiling point is raised to 354.11 K . Calculate the molar mass of the solute. ( K_(b) for benzene is 2.53 K kg mol^(-1) )

By dissolving 13.6 g of a substance in 20 g of water, the freezing point decreased by 3.7^(@)C . Calculate the molecular mass of the substance. (Molal depression constant for water = 1.863K kg mol^(-1))

The boiling point of benzene is 353.23 K when 1.80 g of a non-volatile, non-ionising solute was dissolved in 90 g of benzene, the boiling point is raised to 354.11 K. Calculate the molar mass of solute. " " [Given K_(b) for benzene = 2.53 K kg mol^(-1) ]

Phenol associates in benzene to a certain extent to form a dimer. A solution containing 20 g of phenol in 1.0 kg of benzene has its freezing point lowered by 0.69 K. Calculate the fraction of phenol that has dimerised. [Given : K_(f) for benzene = 5.1 Km^(-1)]

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))

Phenol associates in benzene to certain extent to form a dimer. A solution containing 20 xx 10^(-3) kg of phenol in 1.0 kg of benzene hs its freezing point depressed by 0.69 K . Calculate the fraction of phenol that has dimerized. ( K_(f) for benzene is 5.12 K kg mol^(-1) ).