Question

air contains ------------------------- of percentage of oxygen

Answer 1

Answer:

21%

Explanation:

air contains 21% of percentage of oxygen

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Answer 2

Answer:

Gases . The most abundant naturally occuring gas is Nitrogen (N2) , which makes up about 78% of air .Oxygen (O2) is the second most abundant gas at about 21% .The inert gas Argon (Ar) is the third most abundant gas .

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