A. Rank, from smallest to largest, the changes in entropy of a pan of water on a

Question

A. Rank, from smallest to largest, the changes in entropy of a pan of water on a hot plate, as the temperature of the water
1. goes from 20 oC to 30 oC

2. goes from 30 oC to 40 oC

3. goes from 40 oC to 45 oC

4. goes from 80 oC to 85 oC

B. 8.0 mol sample of an ideal gas expands reversibly and isothermally at 355 K until its volume doubled. What is the change in entropy of the gas?
R = 8.31 J/K

C. 123 g of ice at -10 oC is placed in a lake whose temperature is 20 oC. Calculate the change in entropy of the lake ( cice = 2220 J/KgK, cw = 4190 J/KgK, Lf= 333kJ/K).

Express your answer in J/K in three significant digit.

Explanation / Answer

dE=dQ/T so A. We can see that delta Q 1 and 2 is the same but T2 is bigger than T1 so E2

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