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Ozone question

  1. Feb 28, 2012 #1
    I have been doing some research on ozone recently, and I have a question that none of my resources have answered...

    The following reaction is an exothermic reaction, but how would I calculate the amount of heat energy is released?

    [itex]O_{3} \underbrace{\rightarrow}_{uv\ light} O_{2} + O[/itex]

    where uv wavelength < 290nm
  2. jcsd
  3. Feb 28, 2012 #2
    Am I on the right track? I looked up the energy of the covalent bonds, and in the destruction of ozone, there is a loss of a single covalent bond between 2 oxygen atoms. Therefore the energy released would be 146 kJ / mol?
  4. Feb 28, 2012 #3
    not sure but ozone has resonating structures so that might add something to its stability and hence can effect the energy released
  5. Mar 20, 2012 #4
    Would not a good guess be the heat of formation for ozone minus the energy required to split O2 (that is, create mono-atomic oxygen)? I am assuming that the O3 is prepared by passing an electric arc through air.

    1. O2 --Energy--> O + O

    2. O2 + O ---> O3

    Now, if you do otherwise derive an estimate, then you also have an estimate of the energy required for Equation [1], or at least, a sanity check.
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