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COCl2(g) -> CO(g)+Cl2(g)

  1. May 10, 2009 #1
    COCl2(g) --> CO(g)+Cl2(g)

    1. The problem statement, all variables and given/known data
    Consider the reaction carried out at 25 degrees celsius and 1 atm: COCl2(g)-->CO(g)+Cl2(g)
    In what temperature range will the reaction become (or not become) spontaneous?


    2. Relevant equations



    3. The attempt at a solution[/b
    My hunch is that i have to use ΔG=ΔH-TΔS and set ΔG equal to zero but then i'm not sure how am i supposed to get a temperature range...help please!
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. May 10, 2009 #2

    Mapes

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    Re: Thermodynamics

    Your hunch is correct. The temperature range would be bounded by ΔG=0 and also any temperature at which the components are eliminated: e.g., the boiling temperature of the gases, the dissociation temperature of CO, etc. I'm not sure any of these will be relevant, but it might explain why there's a limited temperature range.
     
  4. May 10, 2009 #3
    Re: Thermodynamics

    How do we know whether the temperature will be above or below that of the temperature that is bounded by ΔG=0?
     
  5. May 10, 2009 #4

    Mapes

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    Re: Thermodynamics

    I don't know. It's something you have to check, just as if you were designing an industrial process to run the reaction.
     
  6. May 10, 2009 #5
    Re: Thermodynamics

    I think you'll need extra information, especially the enthalpy of formation for each species, or the entropy of formation. then you can find T
     
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