A '1.28 g' sample of a colourless liquid was vapourised in a '250 ml' flask at '121^circ C' and '786 mm Hg'. What is the molar mass of this substance?

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?

0.24 g of a volatile liquid on vapourisation gives 45 ml of vapours at STP. What will be the vapour density of the substance? (Density of H_(2)=0.089gL^(-1) )

34.05 ml of phosphorus vapour weights. 0.0625 g at 546^@C and 1 bar pressure. What is the molar mass of phosphorus? (R = 0.083 atm//k//mol)

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 ?

0.25 g of a substance dissolved in 25 g of solvent boiled at a temperature higher by 0.208^@C than that of the pure solvent. What is the molercular mass of the substance. [K_(b)" for solvent =2.16 K kg/mol or Km"^(-1)]

An evacuated glass vessel weighs 50 g when empty, 144.0 g when filled with a liquid of density 0.47 gmLand 50.5 g when filled with an ideal gas at 760 mm Hg at 300 K. The molar mass of the ideal gas is ( Given R = 0.0821 L atm k^(-1) mol^(-1)