Chemistry 2210A/B Lecture Notes - Lecture 3: Smog, Stoicism

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Ground level air pollution: many sources of pollutants; industry and automobile emissions major contributors, many health implications. S (oxidation state of 0) + o2 (oxidation state of 0) so4 (oxidation state of 4) Concentration units: concentration scales (ppm, ppb, ppt, parts per ______ (million, billion or trillion, molecules per cm3 of air, micrograms, g, (of pollutant) per m3 (of air, moles of gas per litre of air (molarity, partial pressure. Pressure is proportional to number of moles/molecules: all are ratio of: pollutant/air. Numerator: convert 320 mg so2 to moles. 320 x 10-6 g / 64. 1 gmol-1 = 4. 99 x 10-6 moles. Pv = nrt: n = (1. 0 atm x 1000 l) / (0. 082 l atm/mol r x 300 k) = 40. 7 mols of air, 40. 7 moles of air = 40. 7 x 10-9 billion moles. Trace gases in air: many natural sources of gases: fires, lightning, anaerobic decay, volcanic emissions.

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