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Homework Help: Decompose to water and oxygen

  1. Sep 4, 2009 #1
    hydrogen peroxide can decompose to water and oxygen by following reaction:
    2H2 O2 (l) = 2H2 O(l) + O2(g) deltaH= -196kJ

    CALCULATE THE VALUE OF q when 5.00g of H2 O2(l) decomposes at constant pressure.

    my answer is -14.4J...........can some please tell me how to do this again because I forgot what step I took and it have a similar question on another homework
  2. jcsd
  3. Sep 4, 2009 #2
    delta H is in terms of kJ per mole of equation; how many moles of H2O2 are there in 5.00g and how many 'moles of equation' are there?
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