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Discussion

A hot metal piece is cooled rapidly to 25°C, removing 1000 kJ from the metal. Calculate the change of entropy if energy is absorbed by ice.

  • A.2.662 kJ/K
  • B.3.662 kJ/K
  • C.4.662 kJ/K
  • D.5.662 kJ/K

Answer: B

Ice melting at 0°C; m = 1Q2 /h(fg) = 1000/333.41 = 2.9993 kg
∆S(H2O) = ms(ig) = 2.9993(1.221) = 3.662 kJ/K

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