For a liquid, enthalpy of fusion is 1.435kcalmol−1 and molar entropy change is 5.26calmol−1K−1 The melting point of the liquid is:
A
100∘C
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B
0∘C
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C
273∘C
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D
373∘C
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Solution
The correct option is B0∘C We know that, △Sfusion=△HfusionTm.p. Tm.p. is the melting point. △Hfusion=1435cal/mol
putting all the values, Tm.p.=14355.26=273K=0∘C
Theory:
Entropy Calculation with phase transformation: Phase change occurs at constant Pressure & Temperature and is considered reversible if it occurs at its transition temperature.
Entropy change for Fusion: At constant pressure, q=qp = ΔH ΔSfusion = ΔHfusionTm.p. where T is melting point of a substance.