The table below from NOAA provides the top seven constituents of dry air, represented as parts per million by volume (ppmv). For ideal gases, the mole fraction is equal to ppmv/106 . Calculate the following: (a) average molecular weight (g/mol) for air containing the constituents in the table below (b) the weight percent of neon in that air Component ppm (by volume) N2 780840 O2 209460 Ar 9340 CO2 400 Ne 18.18 He 5.24 CH4 1.7