### Hydrogenation is the addition of $\mathrm{H}_{2}$…

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Problem 95

Consider the following reaction:
$$2 \mathrm{NOBr}(g) \rightleftharpoons 2 \mathrm{NO}(g)+\mathrm{Br}_{3}(g) \quad K=0.42 \mathrm{at} 373 \mathrm{K}$$
Given that $S^{\circ}$ of $\operatorname{NOBr}(g)=272.6 \mathrm{J} / \mathrm{mol}$ . $\mathrm{K}$ and that $\Delta S_{\mathrm{rxn}}^{\circ}$ and $\Delta H_{\mathrm{rxn}}^{\circ}$ are constant with temperature, find
(a) $\Delta S_{\mathrm{rxn}}^{\circ}$ at 298 $\mathrm{K}$
(b) $\Delta G_{\mathrm{rxn}}^{\circ}$ at 373 $\mathrm{K}$
(c) $\Delta H_{\mathrm{rxn}}^{\circ}$ at 373 $\mathrm{K}$
(d) $\Delta H_{\mathrm{f}}^{\circ}$ of $\mathrm{NOBr}$ at 298 $\mathrm{K}$
(e) $\Delta G_{\text { rxn }}^{\circ}$ at 298 $\mathrm{K}$
(f) $\Delta G_{\mathrm{f}}^{\circ}$ of $\mathrm{NOBr}$ at 298 $\mathrm{K}$

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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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