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Solution: The heat of vaporization of methanol, CH3OH, is 35.2 kJ/mol. Its boiling point is 64.6°C. What is the change in entropy for the vaporization of methanol?

Problem

The heat of vaporization of methanol, CH3OH, is 35.2 kJ/mol. Its boiling point is 64.6°C. What is the change in entropy for the vaporization of methanol?

Solution

Heat of vaporization is the amount of heat absorbed by a liquid at its boiling point for phase change from liquid to gas.


The entropy of a liquid increases during the evaporation process since gases have higher entropies than liquids.


The relation between entropy and heat of vaporization is given by:


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