How do you calculate entropy of vaporization?

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Solution

The entropy of vaporization is the increase in the entropy upon vaporization of the liquid.
This is always positive, since the degree of disorder increases in the transition from a liquid in a relatively small volume to a vapour or gas occupying a much larger space.

The entropy of vaporization is then equal to the heat of vaporization divided by the boiling point.

$Δ S_{v a p} = \frac{Δ H_{v a p}}{T_{v a p}}$

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