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Homework Help: Change in entropy for adding quanta

  1. Dec 9, 2011 #1
    1. The problem statement, all variables and given/known data
    Suppose you have 7 atoms with only 6 quanta. If you add 2 quanta to the system, find the change in entropy to the system.

    2. Relevant equations
    S = k_B*ln(omega)
    Change in S = S_f - S_o

    3. The attempt at a solution
    So, I found the multiplicity, before and after, using the following equation to find the number of states:

    Number of states = (q + N - 1)!/[q!(N-1)!].

    So, I obtained 924 states for the initial system and 3003 states for the final system.

    I tried to do: Change in S = k_B*ln(3003) - k_B*ln(924)... but ended up with the incorrect answer.

    Is there something wrong with my reasoning?
  2. jcsd
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