A one  - litre vessel contained a gas at 27^oC. 6 g of charcoal was introduced into it. The pressure of the gas fell down from 700 mm to 400 mm. Calculate the volume of the gas (at S.T.P) adsorbed per gram of charcoal. Density of charcoal sample used was 1.5 g cm^-3 .

20% of surface sites are occupied by N₂ molecules. The density of surface sites is \(6.023\times { 10 }^{ 14 }\) cm^-2 and total surface area is 1000 cm² . The catalyst is heated to 300 K while N₂ is completely disorbed into a pressure of 0.001 atm and volume 2.46 cm³. Find the active sites occupied by each N₂ molecule.

In an adsorption experiment, a graph between log (x/m) versus log P was found to be linear with a slope of 45^o. The intercept on the log (x/m) axis was found to be 0.310. Calculate the amount of the gas adsorbed per gram of charcoal under a pressure of 0.5 atmosphere.

The volume of nitrogen gas v_m (measured at S.T.P) required to cover a sample of silica gel with a mono - molecular layer is 129 cm³g^-1 of gel. Calculate the surface area per gram of the gel if each nitrogen molecule occupies \(16.2\times { 10 }^{ -20 }{ m }^{ 2 }\).

An emulsion is a colloidal dispersion in which both the dispersed phase and the dispersion medium are liquids. (The two liquids involved are otherwise immiscible).