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A dry flue gas is 10 per cent carbon dioxide, 5 per cent oxygen and the rest nitrogen. What is the nitrogen percentage?

  • A.85 per cent
  • B.80 per cent
  • C.90 per cent
  • D.15 per cent

Answer: A

The three must sum to a hundred on the dry basis, so nitrogen is eighty-five per cent. The nitrogen figure is then used as the tie component to find the air actually supplied. It is the only species that passes through unchanged.

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