The quantity ?Sgenerated of a 10-kg copper mass (use Cp,cu = 0.39 kJ/kg·K) at 100°C submerged in a 20°C lake is nearest:
A) 0.341 kJ/K
B) 0.239 kJ/K
C) 0.123 kJ/K
D) 0.108 kJ/K
C) 0.123 kJ/K
The entropy change of the copper is 
and that of the water is Q/T. Hence,
The copper loses entropy and the water gains entropy. Make sure the heat transfer to the water is
positive.
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