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Atmospheric Chemistry: Concentration Units Quiz
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Atmospheric Chemistry: Concentration Units Quiz

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Questions and Answers

Which unit is used to express the concentration of substances in air as parts per million by volume?

  • ppm(1 in 10^6) (correct)
  • ppb(1 in 10^9)
  • %(v/v) or % (mol/mol)
  • ppt(1 in 10^12)

    • What is the equivalent value of 1 ppmv (parts per million by volume) in terms of volume of gaseous pollutant to volumes of air?

  • 1 volume of gaseous pollutant/10^3 volumes of air
  • 1 volume of gaseous pollutant/10^12 volumes of air
  • 1 volume of gaseous pollutant/10^9 volumes of air
  • 1 volume of gaseous pollutant/10^6 volumes of air (correct)

    • What is the concentration unit for atmospheric pollutants expressed as 1 in 10^9 volumes of air?

  • ppt(1 in 10^12)
  • %(v/v) or % (mol/mol)
  • ppm(1 in 10^6)
  • ppb(1 in 10^9) (correct)

    • What is the molar mass of a gaseous pollutant if 1 ppm is equivalent to 40.9 M μg/m3?

    <p>2.045</p> Signup and view all the answers

    What is the conversion factor between parts per million (ppm) and parts per billion (ppb)?

    <p>1000000</p> Signup and view all the answers

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