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Entropy change

  • Thread starter swain1
  • Start date
  • #1
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Homework Statement


Calculate the changes in total entropy of the universe as a result of the following processes:
(a) A block of mass 6kg and heat capacity of 300 J/K/kg at 150oC is placed in a lake at 0oC.

Homework Equations





The Attempt at a Solution


I think I have found the entropy change of the block as -788 J/K. I am not sure how to find the entropy change of the lake though as I don't know the mass.
Thanks for any help.
 

Answers and Replies

  • #2
The change should be equal but opposite. Heat is leaving the block and going into the water... What leave the block must enter the water...
 
  • #3
30
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yes the energy transfer will be the same but not the entropy.??
 

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