a 7.24 A sample of Ni foil, weighing 5.40 g and having a surface area of 255 cm?g=1, is oxidized *773 K and 0.12 bar O2 pressure. The reaction, O2(g) + Ni(s) NiO(s), occurs and the O2 uptake is measured as the Nio film grows. The density of NiO is 6.67 g cm-. The kinetics of film growth follows the parabolic rate law where l = the film thickness: de k dt Calculate the rate constant, k, in s-1, from the following data: top Time (hr) O2 uptake (mols) 2 3.08 x 10-2 3 sanoo 4.12 x 10-2 4 5.00 x 10-2 5 5.75 x 10-2 6 6.26 x 10-2 7 6.93 x 10-2 8 7.50 x 10-2 9 8.05 x 10-2 10 8.59 x 10-2