Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Enthalpy of formation

  1. Nov 3, 2006 #1
    Hi, I have a question involving enthalphy of formation. I tried doing this problem but I couldn't seem to get the right answer. I was wondering if anyone here may please help me out. Thanks.

    Question: How much heat is evolved when 13.39 moles of CO(g) is burned in excess oxygen.
    [tex]2CO(g) + O_2(g)\rightarrow 2CO_2(g)[/tex]
    Molar enthalpies are
    [tex]CO=-110.5 kJ/mol[/tex]
    [tex]CO_2=-393.5 kJ/mol[/tex]
  2. jcsd
  3. Nov 6, 2006 #2
    you figure out the Change of Enthalpy (change of H) of overall equation, and then multiply by 13.39 moles of CO to get energy (KJ).

    just to make sure...

    Change of H = [(2)(-110.5KJ)] -[(2)(-110.5KJ)] = ?? KJ

    then mult ?? KJ by 13.39 mol

    does it give you the right answer?? would like to know
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook