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Homework Help: Latent heat problem HELP!

  1. Apr 15, 2010 #1
    1. The problem statement, all variables and given/known data
    The latent heat of vaporization for water is 540 kcal/kg. By how much does the entropy of 50g of water at 100oC change if the water is very slowly converted into steam at 100oC?

    2. Relevant equations

    3. The attempt at a solution
    would it be 0 heat change plus the 540? = 540 total?
  2. jcsd
  3. Apr 15, 2010 #2
    No, it's not zero heat change. Certainly some heat enters the water to make it steam. How would you use the latent heat of vaporization to find out how much?
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