How does entropy change in the following processes ? Explain. (a)… - Vidyadip

Question

How does entropy change in the following processes ? Explain.
(a) freezing of a liquid
(b) sublimation of a solid
(c) dissolving sugar in water
(d) condensation of vapour.

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Answer

(a) Freezing of a liquid results in decrease in randomness and disorder, hence entropy decreases, $\Delta S<0$.
(b) Sublimation of a solid converts it into vapour where the molecules or atoms are free to move randomly. Hence disorder increases accompanying increase in entropy, $\Delta S>0$.
(c) Dissolving sugar in water separates the molecules of sugar in the solution increasing disorder and entropy, $\Delta S >0$.
(d) Condensation of vapour decreases the disorder and randomness, hence entropy, $\Delta S <0$.

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