Entropy: A 0.42-kg quantity of ethanol, in the liquid state at its melting point of -114.4°C, is frozen at atmospheric pressure. The heat of fusion of ethanol is 1.04 × 105 J/kg, and its molecular mass is 46.1 g/mol. What is the change in the entropy of the ethanol as it freezes?
A. -280 J/K
B. -250 J/K
C. -310 J/K
D. 250 J/K
E. 280 J/K
Answer: A
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Two tiny particles having charges of +7.00 ?C and -9.00 ?C are placed along the y-axis. The +7.00-µC particle is at y = 0.00 cm, and the other particle is at y = 40.00 cm
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Answer: C
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