The rate at which a substance passes through a semipermeable membrane is determined by the diffusivity d cm2/s of the gas. d varies with the membrane temperature t k according to the arrhenius equation: d d0 exp e/rt where d0 the preexponential f actor e the activation energy for diffusion r 1: 987 cal/ mol k diffusivities of so2 in a fluorosilicone rubber tube are measured at several temperatures, with the following results: t k d cm2/s 106 347.0 1.34 so that d 1: 34 106 cm2/s 374.2 2.50 396.2 4.55 420.7 8.52 447.7 14.07 471.2 19.99 (a) what are the units of d0 and e? (b) how should the data be plotted to obtain a straight line on rectangular coordinates? (c) plot the data in the manner indicated in part (b), and determine d0 and e from the resulting line. (d) repeat part (c) using a spreadsheet program.