ISRO Mechanical & Aerospace 2011 - Question 24

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Ninety kilograms of ice at 0°C are completely melted. Find the entropy change, in kJ/K, if $T_2 = 0°C$. (Latent heat of fusion is 318.5 kJ/kg.K)

  • A. 0
  • B. 45
  • C. 105
  • D. 85

Answer: C. 105

Explanation: $\Delta S = Q/T = m L / T = 90 \times 318.5 / 273 \approx 105$ kJ/K.

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