The normal boiling point of ethanol should be estimated using thermodynamic data which then has to be identified that how well it agreed with the actual value.
The Gibbs free energy or the free energy change is a thermodynamic quantity represented by . It is related to entropy and entropy by the following expression,
Here, is the change in enthalpy and is the change in entropy.
The value of is zero at the boiling point of the liquid. Thus the entropy change can be written as,
Thus, the temperature at which vaporization takes place can be calculated if and values are known.
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