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Problem 53

Rank each set of substances in order of increasing standard molar entropy $\left(S^{\circ}\right) .$ Explain your reasoning.
$$\begin{array}{l}{\text { a. } \mathrm{NH}_{3}(g) ; \mathrm{Ne}(g) ; \mathrm{SO}_{2}(g) ; \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}(g) ; \mathrm{He}(g)} \\ {\text { b. } \mathrm{H}_{2} \mathrm{O}(s) ; \mathrm{H}_{2} \mathrm{O}(l) ; \mathrm{H}_{2} \mathrm{O}(g)} \\ {\text { c. } \mathrm{CH}_{4}(g) ; \mathrm{CF}_{4}(g) ; \mathrm{CCl}_{4}(g)}\end{array}$$

Answer

PART $\mathrm{A} : \operatorname{He}(\mathrm{g})<\mathrm{Ne}(\mathrm{g})<\mathrm{SO}_{2}\left(\mathrm{g}<\mathrm{NH}_{3}(\mathrm{g})<\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}(\mathrm{g})\right.$
PART B: $\mathrm{H}_{2} \mathrm{O}(\mathrm{s})<\mathrm{H}_{2} \mathrm{O}(\mathrm{l})<\mathrm{H}_{2} \mathrm{O}(\mathrm{g})$
PART $\mathrm{C} : \mathrm{CH}_{4}(\mathrm{g})<\mathrm{CF}_{4}(\mathrm{g})<\mathrm{CCl}_{4}(\mathrm{g})$

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