16.On dissolving 8.8 gm of non-volatile solute to 100 gm of water the vapour pressure of ice becomes 4.559 mm Hg. If vapour pressure of pure ice is 4.58 mm Hg than molecular weight of the substance should be

17.At constant temperature, the concentration of a slightly soluble gas in a liquid is directly proportional to the partial pressure of the gas. This is in accordance with

18.Molality of a solution is the number of moles of solute in

19.When 18 g of a compound was dissolved in 100 g of water, the vapour pressure of the latter was lowered from 17.54 mm to 17.23 mm of mercury. The molecular mass of compound is

20.The vapour pressure of water at room temperature is 30 mm. If the mole fraction of the solvent in solution is 0.9, the vapour pressure of aqueous solution at room temperature will be