It is just under 21 %.
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The ratio is approx 268 to 1000.
The ratio of atoms in monosaccharides is 1 carbon: 2 hydrogen: 1 oxygen.
The ratio is approxNitrogen : Oxygen : Argon : Carbon Dioxide :: 39000 : 10500 : 465 : 19.
2 atoms of hydrogen to 1 atom of oxygen.
2.66666666667 is the decimal of oxygen in the air