An organic solvent with a molar mass of 56.45 g/mol have a normal boiling point of 45.0 °C and a normal freezing point of -14.0 ºC. If ΔHº of vaporization is 34.4 kJ/mol, ΔHº of fusion is 1.4 kJ/mol, specific heat capacity of the liquid is 2.88 J/mol.ºC ,specific heat capacity of the solid is 0.765 J/mol.ºC and specific heat capacity of the gas is 1.43 J/mol.ºC. Calculate the amount of heat (in kJ) released when 24.0 g of this solvent is converted from liquid at the normal boiling point to solid at the normal freezing point.

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An organic solvent with a molar mass of 56.45 g/mol have a normal boiling point of 45.0 °C and a normal freezing point of -14.0 ºC. If ΔHº of vaporization is 34.4 kJ/mol, ΔHº of fusion is 1.4 kJ/mol, specific heat capacity of the liquid is 2.88 J/mol.ºC ,specific heat capacity of the solid is 0.765 J/mol.ºC and specific heat capacity of the gas is 1.43 J/mol.ºC.

Calculate the amount of heat (in kJ) released when 24.0 g of this solvent is converted from liquid at the normal boiling point to solid at the normal freezing point.

 
Expert Solution
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According to the question we have,

Mass of liquid is given by = 24.0 g

Specific heat capacity of the liquid= 2.88 J/mol°C

Normal freezing point temperature ( final temperature)= -14°C

Normal boiling point temperature ( initial temperature) = 45.0°C

The enthalpy of the vapourization is given by = 1.4 Kj/mol = 1.4×103 J/mol

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