24.14 Compare the effective diffusion coefficient for a dilute mixture of oxygen gas (O2, species A) in nitrogen gas (N2, species B) at 20C and 1.0 atm within the following materials:

a) Straight 10 nm pores in parallel array

b) Random pores of 10 nm diameter with void fraction of 0.40

From Appendix J, Table J.1, the molecular diffusion coefficient of O2 in N2 gas is 0.181cm2/s at 1.0 atm and 273 K. Remember,1x10^9 nm=1.0m,and 1x10^6 m=1.0m.

I've seen a lot of solutions that use 1 x10^6 nm = 1 cm but isn't the conversion 1x10^7 nm = 1 cm?