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Problem 86

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University of New Mexico

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Problem 85

According to advertisements, “a diamond is forever.”
(a) Calculate $\Delta H^{\circ}, \Delta S^{\circ},$ and $\Delta G^{\circ}$ at 298 $\mathrm{K}$ for the phase change
(b) Given the conditions under which diamond jewelry is normally kept, argue for and against the statement in the ad.
(c) Given the answers in part (a), what would need to be done to make synthetic diamonds from graphite?
(d) Assuming $\Delta H^{\circ}$ and $\Delta S^{\circ}$ do not change with temperature, can graphite be converted to diamond spontaneously at 1 $\mathrm{atm} ?$

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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