Question

The change in entropy when 3 moles of ethanol melt at its melting point is 90 JK-1

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The enthalpy of fusion of ethanol is 4.5 KJ/mol. What is the m.p. of ethanol?
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Answer 1

Answer:

We know that

ΔSvapour=TbpΔHvapour

Given, ΔSvapour=109.8JK−1mol−1

Tbp=78.5+273=351.5K

Substituting these values in above equation, we get

109.8=351.5ΔHvapour

ΔHvapour=38594Jmol−1=38.594kJmol−1