Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook