Compare predictions for the diffusivity of He, C6H12 and H20 in air at 298 K and 1 atm using the kinetic theory of gases and the Chapman-Enskog theory. How do the predictions stack up to the actual experimental data (you will have to find data for this part)? What reasons related to the chemical or structural nature of the molecules or atoms on the list do you believe may be responsible for these discrepancies?