If you have 9 molecules of SO2 gas in 2.811 × 105 molecules of air, what is the concentration of SO2 in parts per million?
Answer in units of ppm
1 million = 1 x 10^6
2.811 x 10^5 molecules x (1 million / 1 x 10^6 ) = 0.281 million
parts / million = 9 / 0.281 = 32.0 parts/million
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Verified answer
1 million = 1 x 10^6
2.811 x 10^5 molecules x (1 million / 1 x 10^6 ) = 0.281 million
parts / million = 9 / 0.281 = 32.0 parts/million