Air consists of various molecular gases. At sea level, air also...

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    Air consists of various molecular gases. At sea level, air also contains an average of 1% water vapor.

    So, at STP (0°C, 760mm Hg) 1 mole (22.4 Liters), contains, approximately, the following:

    Name, Formula, ppmv, in %

    Nitrogen, N2, 780,840, 78.084

    Oxygen, O2, 209,460, 20.946

    Argon, Ar, 9,340, 0.9340

    Carbon dioxide, CO2, 400, 0.04

    Neon, Ne, 18.18, 0.001818

    Helium, He, 5.24, 0.000524

    Methane, CH4, 1.79, 0.000179

    Water Vapor, H20, 10,000, 1.0

    Working the numbers for atoms and electrons per molecules and multiplying by Avagadro’s Number, we get 1.22E24 atoms and 1.69E25 electrons per mole.

    CONCLUSION
    So for a significant change in the number of electrons, would be the increase or depletion of the major component of air, namely nitrogen or oxygen.

    CO2 hardly makes any impact.
 
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