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Homework Help: Release of Heat in kJ - Immediate Help Needed

  1. Apr 15, 2008 #1
    I am struggling with a recent chemistry lesson. Immediate help is needed and would be greatly appreciated. I know that we have to first find the limiting reagent, and then go on to determine the heat released in kiloJoules.

    1. The problem statement, all variables and given/known data

    How much heat will be released when 4.72 g of carbon reacts with excess O2 according to the following equation?

    2. Relevant equations

    C + O2 --> CO2 (Delta) H = -393.5 kJ

    3. The attempt at a solution
  2. jcsd
  3. Apr 15, 2008 #2


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    Science Advisor
    Homework Helper

    How many moles of C are there in 4.72g?
    The equation says you get 393.5kJ for each mole.
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