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Answer;

0.0024%

Explanation;

  • Parts per million or ppm means out of a million. Usually describes the concentration of something in water or soil.
  • One ppm is equivalent to 1 milligram of something per liter of water (mg/l) or 1 milligram of something per kilogram soil (mg/kg).

Therefore to convert 24 ppm of CO as a percentage.

24 ppm × 100%

(24/10⁶)× 100%

= 0.0024%

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