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Problem 92

To prepare nuclear fuel, $\mathrm{U}_{3} \mathrm{…

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Problem 91

Magnesia (MgO) is used for fire brick, crucibles, and furnace linings because of its high melting point. It is produced by decomposing magnesite $\left(\mathrm{MgCO}_{3}\right)$ at around $1200^{\circ} \mathrm{C} .$
(a) Write a balanced equation for magnesite decomposition.
(b) Use $\Delta H^{\circ}$ and $S^{\circ}$ values to find $\Delta G^{\circ}$ at 298 $\mathrm{K}$ .
(c) Assuming that $\Delta H^{\circ}$ and $S^{\circ}$ do not change with temperature, find the minimum temperature at which the reaction is spontaneous.
(d) Calculate the equilibrium $P_{\mathrm{CO}_{2}}$ above $\mathrm{MgCO}_{3}$ at 298 $\mathrm{K}$ .
(e) Calculate the equilibrium $P_{\mathrm{CO}}$ above $\mathrm{MgCO}_{3}$ at 1200 $\mathrm{K}$

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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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