### Which of these processes are spontaneous? (a) Wat…

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Problem 7

(a) What is the entropy of a perfect crystal at 0 $\mathrm{K}$ ?
(b) Does entropy increase or decrease as the temperature rises?
(c) Why is $\Delta H_{\mathrm{f}}^{\circ}=0$ but $S^{\circ}>0$ for an element?
(d) Why does Appendix $\mathrm{B}$ list $\Delta H_{\mathrm{f}}^{\circ}$ values but not $\Delta S_{\mathrm{f}}^{\circ}$ values?

Answer
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Chapter 20
Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions
CHEMISTRY: The Molecular Nature of Matter and Change 2016

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