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Estimate the latent heat of water

  1. May 24, 2015 #1
    1. The problem statement, all variables and given/known data

    Try to estimate the latent heat of vaporization of water and nitrogen using the Van der Waals model. What happens?

    2. Relevant equations

    $$ΔQ=TΔS=L$$

    $$S=nR[\ln(\frac{(V−nb)T^{3/2}}{nΦ})+\frac{5}{2}]$$


    3. The attempt at a solution

    I predict the latent heat of vaporization of water will be wrongly approximated by the Van der Waals model. By looking at the equation for entropy I think the ΔS is going to be zero, so the latent heat would be zero also. But I am not sure if I am looking at the problem in the wrong way.
     
  2. jcsd
  3. May 25, 2015 #2

    BvU

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    Why would ##\Delta S## be zero ?
     
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