The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolyte solid weighing 0.5g when added to 39g of benzene (molar mass 78g `mol^(-1)`), vapour pressure becomes 0.845 bar. What is the molar mass of the solid substance ?

The vapour pressure of pure water at a given temperature is 500 torr. When 0.1 mol of a normal non volatile solute is dissolved in 9.9 moles of water at this temperature, the lowering of vapour presure produced is

What mass of solute ("molar mass=60 g mol"^(-1)) should be dissolved in 180 g water to reduce the vapour pressure to 4/5 th of pure water :

2.9g of a gas 95^@C occupied the same volume as 0.184g of H_2 at 17^@C at the same pressure. What is the molar mass of the gas?

1.00g of a non-electrolyte solute dissolved in 50g of benzene lowered by 0.40K. The freezing point depression constant of benzene is 5.12K kg//mol . Find the molar mass of solute.

1.00g of a non-electrolyte solute dissolved in 50g of benzene lowered the freezing point of benzene by 0.40K. Freezing point depression constant of benzene is 5.12K g//mol . Find the molar mass of solute. .

An aqueous solution of '2 %' non-volatile sol ute exerts a pressure of 1.004 bar at the nor mal boiling point of the solvent. What is the molar mass of the solute?

A solution containing 0.1 g of a non-volatile organic substance P (molecular mass 100) in 100 g of benzene raises the boiling point of benzene by 0.2^@C, while a solution containing 0.1 gof another non-volatile subistance Q in the same amount of benzene raises the boiling point of benzene by 0.4^@C . What is the ratio of molecular masses of P and Q?

34.05 mL' of phosphorus vapour weighs '0.0625 g' at '546^degree C' and '0.1' bar pressure. What is the molar mass of phosphorus?

A solution containing '30 g' of.non-volatile solute exactly in '90, g' of water has a vapour pressure of '2.8 kPa' at '298 K'. Further, '18 g' of water is then added to the solution and the new vapour pressure becomes '2.9 kPa' at '298K' Calculate: (i) molar mass of the solute (ii) vapour pressure of water at '298 K'.