A sample of dry air contains approximately 78% nitrogen, 21% oxygen, 0.93% argon and 0.04% carbon dioxide.If a container holds 2,500 litres of dry air, approximately how many litres of gases other than nitrogen and oxygen does it contain?

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• A 23.25L
• B 25L
• C 46.5L
• D 46.25L

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Answer: B. 25L

If you group nitrogen and oxygen together, they make up 99% of the dry air: 78%+21%. 100%-99%= 1% 1% of 2500L =25litres.

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