what mass of carbon dioxide is present in 1.00m^3 of dry air at a temperature of 19C and of 685 torr. Calculate the mass percent of oxygen in dry air.

Air is a mixture of several gases. The 10 most abundant of these gases are listed here along with their mole fractions and molar masses. Molar mass Component Mole fraction (g/mol) Nitrogen 0.78084 28.013 Oxygen 0.20948 31.998 Argon 0.00934 39.948 Carbon dioxide 0.000375 44.0099 Neon 0.00001818 20.183 Helium 0.00000524 4.003 Methane 0.000002 16.043 0.00000114 83.80 Krypton Hydrogen 0.0000005 2.0159 Nitrous oxide 0.0000005 44.0128