(Solved): Calculate \( \Delta H_{\text {rxn }} \) for the following reaction: \[ \mathrm{SrO}(\mathrm{s})+\ma ...

Calculate \( \Delta H_{\text {rxn }} \) for the following reaction: \[ \mathrm{SrO}(\mathrm{s})+\mathrm{CO}_{2}(\mathrm{~g}) \rightarrow \mathrm{SrCO}_{3}(\mathrm{~s}) \] Use the following reactions and the given values of \( \Delta H \) for them. \[ \begin{aligned} \mathrm{Sr}(\mathrm{s})+\mathrm{CO}_{2}(\mathrm{~g})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~s}) & \rightarrow \mathrm{SrCO}_{3}(\mathrm{~s}), \quad \Delta H=-819.5 \mathrm{~kJ} \\ 2 \mathrm{Sr}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) & \rightarrow 2 \mathrm{SrO}_{\mathrm{r}}(\mathrm{s}), \quad \Delta H=-1096.0 \mathrm{~kJ} \end{aligned} \] Express the enthalpy change in kilojoules to four significant figures.