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Homework Help: The reaction of rusting iron and the heat produced

  1. Nov 2, 2008 #1
    1. The problem statement, all variables and given/known data
    4Fe+3O2=2Fe2O3 deltaH=-1.65 x 10^3kJ

    If there are 15.7 grams of iron and 7.99 grams of oxygen, how much heat will be produced?

    2. Relevant equations
    Since Iron is the limiting reagent do I use that to determine the heat released?

    3. The attempt at a solution
    15.7gFe x 1molFe/55.9gFe x 1molFe/4molFe x -1.65x10^3kJ/1molFe = -116kJ
  2. jcsd
  3. Nov 3, 2008 #2


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    Staff: Mentor

    Looks OK to me, but think about sign. You are not asked about delta H for the reaction, but about amount of the heat released.
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