how much oxygen present in air a)20.9% b)30.6% c)100%. d)10.6%. anwer is=20.9%
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Answer:
a)20.9%
Explanation:
Air is mostly gas
The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen
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