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16. An ideal gas is maintained at a tempera- ture of 250 K through contact with a ther- mal reservoir and is free to expand against a piston. If 5000 J of heat is slowly added to the gas, what is the change in entropy of the gas? (A) 10 J/K (B) 10 In 2 J/K (C) 20 J/K (D) 40 J/K (E) 500 J/K
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