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Free energy how to measure it

  1. Mar 9, 2004 #1

    gee

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    Hi everybody,
    I'm working on a project aiming to determine what are the differents ways to measure the free energy (gibbs) and the enthalpy of reactions.
    And I have no idea.
    If you know some equipments or some procedure to measure it or also where i should look for it, I would be very happy.

    Thank you very much in advance.
     
  2. jcsd
  3. Mar 9, 2004 #2

    Bystander

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    For the second time, you are going to have to be more specific. What types of reactions? What conditions? What resource constraints?
     
  4. Mar 10, 2004 #3

    gee

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    free energy

    Hi, thank you for the attention that you pay to my question.
    Acutally, My ressearch is broad. I've tried to find information but i found nothing. I just want to know the names of equipments and procedures that are the most used to measure free energy (and enthalpy). In a second time, when i will know a little bit more about it, i will orient my ressearch in a more specific way.
    But for now, I need clues.

    Thank you in advance.
     
  5. Mar 10, 2004 #4

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    J. R. Partington, Advanced Treatise on Physical Chemistry; Weissberger, Physical Methods of Organic Chemistry; Shoemaker and Garland, Experiments in Physical Chemistry.
     
  6. Mar 11, 2004 #5
    To find the enthalpy and gibbs free energys you can use standadard entyhapys of formation (found in any text book)

    Experimentaly you can use an caliometer or a bombcalimoter. These devices will mechaure the heat change of the surroundings (therm system). With these values you can determine the enthaply by the following eq. (@ constant pressure) /delta H = /Delta T times nC; where H equals enthalpy and /delta T equals change in tempature of system and C equals molar heat capaicity and n equals quantily of substnace. For there to calculating the gibbs free energy is easy
    /delta G = /delta H - T(/delta S) ; where delta S equals entropy = q (reverse)/Tempature
     
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