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Why heat of combustion is not the reverse of the heat of formation

  1. Apr 24, 2010 #1
    Using Methane gas as an example (CH4 gas), explain why one can not assume the heat of combustion is the reverse of the heat of formation.

    I can't find a decent answer to this anywhere.
  2. jcsd
  3. Apr 29, 2010 #2


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    Define heat of combustion.

    Now, define heat of formation.

    It WILL be obvious. I promise.
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