Problem

For N2 adsorbed on a certain sample of ZnO powder at 77 K, adsorbed volumes (recalculated...

For N2 adsorbed on a certain sample of ZnO powder at 77 K, adsorbed volumes (recalculated to 0°C and 1 atm) per

gram of ZnO vs. N2 pressure are

P/torr	υ/(cm3/g)	P/torr	υ/(cm3/g)	P/torr	υ/(cm3/g)
56	0.798	183	1.06	442	1.71
95	0.871	223	1.16	533	2.08
145	0.978	287	1.33	609	2.48

The normal boiling point of N2 is 77 K. (a) Plot υ versus P and decide whether the Langmuir or the BET equation is more appropriate. (b) Use the equation you decided on in (a) to find the volume υmon needed to form a monolayer; also find the other constant in the isotherm equation. (c) Assume that an adsorbed N2 molecule occupies an area of and calculate the surface area of 1.00 g of the ZnO powder.