Silver oxide catalyst on an alumina substrate (Ag2O/Al2O3) was found to be an effective catalyst for the degradation of organic pollutants in wastewater. The data below were recorded for the adsorption of N2 gas on a sample (1.0 g) of this Ag2O/Al2O3 catalyst at 75 K.

P [kPa] 1.87, 6.10, 11.67, 17.03, 21.92

V [cm3@S.T.P.] 72, 82, 94, 105, 115

Saturation vapour pressure Po = 76 kPa.

(i) With the aid of a BET plot indicate clearly that N2 is physically adsorbed onto the catalyst surface.

(ii) Determine the volume corresponding to monolayer coverage, Vm, per g of catalyst.

(iii) Given that the molecular area of nitrogen is estimated to be 0.162 nm2 estimate the surface area of the catalyst in m2 g-1.