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In Dulong's formula the oxygen already present in the fuel is subtracted from the hydrogen because it is

  • A.released as free oxygen during combustion
  • B.counted separately as an additional heat contribution
  • C.assumed already combined with hydrogen as water
  • D.assumed to be inert and to take no part

Answer: C

One part of oxygen is taken to have already satisfied an eighth of its mass in hydrogen, so only the remaining hydrogen is available to release heat. The correction is why the term is written as hydrogen minus oxygen over eight.

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