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30. Air contains 79% N2 and 21% O2 by volume . The percentage by mass of nitrogen gas in the air is 1. 76.6% 2. 24% 3. 29% 4. 48%

Answer» 30. Air contains 79% N2 and 21% O2 by volume . The percentage by mass of nitrogen gas in the air is 1. 76.6% 2. 24% 3. 29% 4. 48%


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