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The change in entropy of the gas vs thermal reservoir

  1. Jun 1, 2014 #1
    1. The problem statement, all variables and given/known data
    Entropy-gas-vs-thermal-reservoir_zps5b392705.png


    2. Relevant equations
    Solution-Entropy-gas-vs-thermal-reservoir_zpsbd26fdd8.png




    3. The attempt at a solution
    I don't know what is the difference between the change in entropy of the gas vs the thermal reservoir??
     
  2. jcsd
  3. Jun 1, 2014 #2
    The equation for then entropy change of the reservoir in the "solution" is incorrect. The sign should be negative. If the final volume of the gas is higher than the initial volume, then the gas absorbs heat from the reservoir, so the reservoir loses heat (and its entropy decreases). The answer to 12 is C.

    Chet
     
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