Step 1: Calculate the change in enthalpy of the reaction, $\Delta H_{\mathrm{rxn}}^{\circ}$, using the equation $\Delta H_{\mathrm{rxn}}^{\circ} = \sum n_{\mathrm{p}}\Delta H_{\mathrm{f,p}}^{\circ} - \sum n_{\mathrm{r}}\Delta H_{\mathrm{f,r}}^{\circ}$, where
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