By volume, dry air contains 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. How much oxygen is present in a room of size 4m* 5m* 3m.
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If the nitrogen =78.08 and oxygen =20.95 argon 0.93 carbon =0.04 so these is simple that oxygen =0.96 because there sum is 99.4 - 100 =.96 so easy it is
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