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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