In a 2:1 N2O:O2 mixture, oxygen percentage?

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Multiple Choice

In a 2:1 N2O:O2 mixture, oxygen percentage?

Explanation:
The oxygen percentage in a gas mixture is its fraction of the total parts. In a 2:1 N2O:O2 mix, there are two parts nitrous oxide and one part oxygen, for a total of three parts. Oxygen makes up 1 of those 3 parts, so the fraction is 1/3, which is about 33%. That’s why the answer is 33%. The other percentages would correspond to different ratios (e.g., 25% would need 1 part out of four, 50% would be equal parts, 75% would need three parts out of four), so they don’t match the given 2:1 ratio.

The oxygen percentage in a gas mixture is its fraction of the total parts. In a 2:1 N2O:O2 mix, there are two parts nitrous oxide and one part oxygen, for a total of three parts. Oxygen makes up 1 of those 3 parts, so the fraction is 1/3, which is about 33%. That’s why the answer is 33%. The other percentages would correspond to different ratios (e.g., 25% would need 1 part out of four, 50% would be equal parts, 75% would need three parts out of four), so they don’t match the given 2:1 ratio.

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