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Homework Help: Net change in entropy

  1. May 9, 2008 #1
    1. The problem statement, all variables and given/known data
    What is the net change in entropy of the system from the time of mixing until the moment the ice completely melts? The heat of fusion of ice is .
    Note that since the amount of ice is relatively small, the temperature of the water remains nearly constant throughout the process. Note also that the ice starts out at the melting point, and you are asked about the change in entropy by the time it just melts. In other words, you can assume that the temperature of the "ice water" remains constant as well.

    In a well-insulated calorimeter, 1.0 of water at 20 is mixed with 1.0 of ice at 0.

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. May 9, 2008 #2
    Entropy is defined as dS = dQ/T (dS = change in entropy, dQ = change in heat, T = temperature in kelvin). Since the temperature is constant, all you have to do is take the total heat required to melt the ice and divide by the temperature in kelvin (i think, anyways!). Oh, and i was just wandering where the units are?
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