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An Orsat analysis of a flue gas reports composition on

  • A.a dry basis, with the water removed
  • B.a wet basis, including the water
  • C.a mass basis rather than a volume basis
  • D.a basis of the fuel rather than the gas

Answer: A

The gas is passed through absorbents over water, so the water vapour condenses and is not counted. Converting an Orsat analysis to a wet basis requires the water to be found from a hydrogen balance. Reporting the basis with the analysis avoids the ambiguity.

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