Chemistry 2210A/B Lecture Notes - Lecture 3: Diesel Fuel, Selective Catalytic Reduction, Catalytic Converter

• School: Western University
• Department: Chemistry
• Course: Chemistry 2210A/B
• Professor: Keith Griffiths

Document Summary

Concentration units: parts per ______ (million, billion or trillion, molecules per cm3 of air, micrograms, g, (of pollutant) per m3 (of air) 10-6, moles of gas per litre of air (molarity, partial pressure. Convert a concentration of 320 micrograms ( g) of so2 per cubic m3 (of air) to the parts per billion scale. (with total air p = 1 atm, temp = 27 c) First, recall that ppb means molecules of so2 per 1 billion molecules of air or moles of so2 per billion moles of air. 320 x 10-6 g /mm (64. 1g/mol) x 6. 022 x 1023 = 3. 01 x 1018 molecules of so2. 1 m3 = 1000l n= 1000l x 1 atm / (300k x 0. 082) = 40. 7 mols x 6. 022 x 1023 = 2. 45 x 1025 molecules. 2. 45 x 1025 / 109 = 2. 45 x 1016 billion molecules. Therefore the concentration is 3. 01 x 1018 / 2. 45 x 1016 per million = 123 pbb.