After 6.00 kg of water at 85.0 8C is mixed in a perfect
Chapter , Problem 79(choose chapter or problem)
After 6.00 kg of water at 85.0 8C is mixed in a perfect thermos with 3.00 kg of ice at 0.0 8C, the mixture is allowed to reach equilibrium. When heat is added to or removed from a solid or liquid of mass m and specifi c heat capacity c, the change in entropy can be shown to be DS 5 mc ln(Tf/Ti), where Ti and Tf are the initial and fi nal Kelvin temperatures. Using this expression and the change in entropy for melting, fi nd the change in entropy that occurs. (b) Should the entropy of the universe increase or decrease as a result of the mixing process? Give your reasoning and state whether your answer in part (a) is consistent with your answer here.
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