What is the percentage of oxygen in the air we inhale?

21%

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16.4%

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18%

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20%

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Solution

The correct option is A
21%

By composition, dry air contains approximately 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Oxygen is approximated to be 21% because it's actual value leans closer to 21%.

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The percentage of oxygen in inhaled air is 21%.

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