Typically, we approximate air as containing 79 mole percent nitrogen and 21 mole percent oxygen. Part 1 Calculate the following: (a) average molecular weight (g/mol) (b) the weight percent oxygen of air approximated as 79.0 mole percent nitrogen and the remainder oxygen Take the molecular weight of O2 to be 31.998 g/mol and that of N2 to be 28.0134 g/mol