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Ethylene reaction

  1. Feb 8, 2005 #1
    just a basic rookie question. What are the products when ethylene reacts with fluorine gas (i.e., burned in presence of fluorine)?

    I was given the following data:
    [itex]H_2 + F_2 \rightarrow 2HF \Delta H^{o} = -537 kJ [/itex]
    [itex]C + 2F_2 \rightarrow CF_4 \Delta H^{o} = -680 kJ [/itex]
    [itex]2C + 2H_2 \rightarrow C_2 H_4 \Delta H^{o} = +52.3 kJ [/itex]

    I used the starting formula [itex] C_2 H_4 + 4F_2 [/itex]

    I balanced out equations and got two possibilities, and I'm not sure which one to go with. In one, it forms 2 hydrogen molecules and 2 carbon tetrafluoride, and in the other it forms 1 C, 2 HF and 1 carbon tetrafluoride. BOTH of these balance out and I don't know which one to go with.
  2. jcsd
  3. Feb 9, 2005 #2


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    Think of the reaction in terms of a dissociation (eqn #3 backwards) followed by a reaction with fluorine. Which of the two reactions with fluorine has a higher probability ?
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