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Oxygen comprises 20.946% of air...

therefore, the amount of air that contains 450mL of oxygen is:

(450mL) / (20.946%) = (450mL) / (0.20946) = 2148mL

Paying attention to significant figures (3) the final answer is 2.15 L of air.

****P.S.

Some teachers simplify the composition of air to contain only 20% oxygen.

If this is the case your answer becomes 2.25L of air.

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14y ago

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