Q.

When 2 mole of ethanol melt at its melting point the entropy change is 60.0 J K-1. If enthalpy of fusion is 4.5kJ mol-1, calculate the melting point of ethanol.

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answer is 150 K.

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Detailed Solution

Entropy change for 2 mole of ethanol = 60.0 J K-1∴ ΔS for 1mol of ethanol =30.0JK−1 We know that ΔSfusion =ΔHfusion Tm or Tm=ΔHfusion ΔSfusion  Thus, Tm=4.5×100030=150K
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