1.30 cm3 of N2, gas at STP is adsorbed per gram of silica gel. The area occupied by nitrogen molecule is 0.16 (nm)2? What is the surface area per gram of silica gel?(NA=6.023 × 1023)

Number of N2 molecules adsorbed per gram of silica gel=1.30×6×102322400=3.48×1019Area of cross section of molecule=0.16(nm)2=1.6×10−19m2 Surface area covered per gram of silica gel=1.6×10−19×3.48×1019=5.568m2