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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?
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: