Thermodynamics - Result Question 41

43. When 1kg of ice at 0∘C melts to water at 0∘C, the resulting change in its entropy, taking latent heat of ice to be 80cal/∘C, is

[2011]

(a) 273cal/K

(b) 8×104cal/K

(c) 80cal/K

(d) 293cal/K

Show Answer

Answer:

Correct Answer: 43. (d)

Solution:

  1. (d) Change in entropy is given by

ΔS=dQT or ΔS=ΔQT=mLf273

ΔS=1000×80273=293cal/K.

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