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Phase change

  1. May 9, 2007 #1
    1. The problem statement, all variables and given/known data
    Ok this one is easy I just want to make sure:
    A metal of mass [tex]M[/tex] is in a smelter at temperature [tex]T_{o}[/tex].
    How much heat does it take to melt the metal. Given: heat capacity, melting point [tex]T_{m}[/tex]


    2. Relevant equations
    [tex]Q=Mc\Delta T[/tex]

    3. The attempt at a solution
    So it would be simply
    [tex] Q=Mc(T_{m}-T_{o})[/tex]
    Right?
     
  2. jcsd
  3. May 9, 2007 #2

    Hootenanny

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    That's just the energy required to heat the metal up to the melting point, what about the actual phase change (i.e. latent heat)?
     
  4. May 9, 2007 #3
    so [tex]\frac{Q}{M}=L[/tex] Q being the previous answer from [tex]Q=Mc\Delta T[/tex]
     
  5. May 9, 2007 #4
    it should be [tex]Q=Mc\Delta T + ML[/tex] if you melt solid to liquid

    [tex]Q=Mc\Delta T[/tex] (unchange state)
    [tex]Q=ML[/tex] (change state)
     
  6. May 9, 2007 #5
    So I am incorrect?
     
  7. May 9, 2007 #6

    Hootenanny

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    Q isn't necessarily that from the previous answer.
     
  8. May 9, 2007 #7
    so..what I am I looking for?
     
  9. May 9, 2007 #8

    Hootenanny

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    I'd be tempted to say that the question isn't answerable unless your given L; but I'm willing to learn...
     
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