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A wet flue gas is 10 per cent carbon dioxide and 20 per cent water by mole. What is the carbon dioxide content on a dry basis?

  • A.8.0 per cent
  • B.30.0 per cent
  • C.12.5 per cent
  • D.10.0 per cent

Answer: C

Removing the water leaves eighty moles per hundred, and ten divided by eighty is twelve and a half per cent. Dividing by the original hundred instead is the standard mistake. Subtracting the water from the total comes first.

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