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Homework Help: Heat question

  1. Apr 20, 2010 #1
    1. How much heat is absorbed when 15g of lead at its melting point are converted completely to a liquid at the same temperature?



    2. (variables: Q=heat, LHf=latent heat of fusion, m=mass) Q=(LHf)(m)



    3. I used the formula and I keep getting 367.5J. The answer I was given states that it is actually about 306J. I really don't understand...

    Help would be gladly received
     
  2. jcsd
  3. Apr 20, 2010 #2
    Your answer is correct.
    I get the same value using L=24.5 kJ/kg and m=0.015kg
     
  4. Apr 20, 2010 #3
    I see...then the worksheet publishers must be in error. Thank you; I wasted a lot of time because I didn't want to get such a simple question wrong.
     
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