Wiki User
∙ 10y ago12
Wiki User
∙ 10y ago62.816
Because the mass of carbon is not the same as that of oxygen.
A blood level showing 63 percent oxygen is a very low reading. It indicates that the person has some type of breathing problem or interference with blood oxygenation.
it means that 70% of what is in the air is oxegon
Cs2O2 APEX 2021
Oxygen comprises about 47% by weight of Earth's crust
97%
45 percent of the earths oxygen is produced by our oceans
The Sun's photosphere comprises 0.77% oxygen by mass but is mostly hydrogen (73.5%).
if this is math and your asking what gas has a percent by volume 78.09 it is nitrogen
oxygen
The Earth's grass produce 20 to 30 percent oxygen. The other 70 to 80 percent of oxygen is produced by marine plants.
1/120 or about 0.8%.
Oxygen.
Oxygen (O2)
The air you breathe comprises three main gases. The largest proportion (79%) comprises the inert gas nitrogen, with oxygen making up 21 percent and carbon dioxide just 0.03 percent
Oxygen Silicon Sodium Potassium Magnesium Iron