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Homework Help: Please explain this entropy change formula for me?

  1. Nov 14, 2007 #1
    [SOLVED] please explain this entropy change formula for me??

    An aluminum bar of mass 2.00 kg at 300 Celsius is thrown into a lake. The temperature of the water in the lake is 15.0Celsius; the specific heat capacity of aluminum is 900 J/(kg*K).
    The bar eventually reaches thermal equilibrium with the lake. What is the entropy change DeltaS_lake of the lake? Assume that the lake is so large that its temperature remains virtually constant.
  2. jcsd
  3. Nov 14, 2007 #2
    nvm i got it
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