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Homework Help: Latent Heat of Fusion/Vaporization

  1. Mar 28, 2010 #1
    1. The problem statement, all variables and given/known data

    Heat is added to a 1.0-kg solid sample of a material at 200 °C. The figure shows the temperature of the material as a function of the heat added.
    http://edugen.wiley.com/edugen/courses/crs1445/art/qb/qu2/c12/r3-1.jpg

    What is the latent heat of fusion of this material?
    What is the latent heat of vaporization of this material?

    2. Relevant equations

    I know that Q = mL equation applies to this concept, but not sure how to go about it

    3. The attempt at a solution

    Q = 100kcal?
    m = 1
    L=Q/m = 100/1 = 100 for fusion?
     
  2. jcsd
  3. Mar 28, 2010 #2

    rock.freak667

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    The latent heats occur during a phase change, so when the temperatures are constant.
     
  4. Mar 28, 2010 #3
    so the latent heat of fusion is 100 kcal? or at the beginning of the constant: 50kcal?
     
  5. Mar 28, 2010 #4

    rock.freak667

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    Homework Helper

    yes it looks like the fusion is 100 kcal, the vaporization would be in the other region.
     
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