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.000380 is 380 millionths, ppm is to millionths what % is to hundredths. If you now move the decimal two places to the right to conver to a percentage, then 380 ppm is approximately .04%, and thus, CO2 makes up .04% of the air (which is what I assume this question is refering to)

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โˆ™ 2013-07-09 11:43:55
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Q: The concentration of carbon dioxide CO2 in air is 380 ppm What is this in a percentage using significant figures?
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