Chemistry - Thermochemistry Question with Solution | TestHub

Calculate $\Delta {\mathrm{H}}^{\circ }$ for the reaction, ${\mathrm{Na}}_2\mathrm{O}(\mathrm{s})+{\mathrm{SO}}_3(\mathrm{g})⟶{\mathrm{Na}}_2{\mathrm{SO}}_4(\mathrm{g})$ given the following: (A) $\mathrm{Na}(\mathrm{s})+{\mathrm{H}}_2\mathrm{O}(l)⟶\mathrm{NaOH}(\mathrm{s})+\frac{1}{2}{\mathrm{H}}_2(\mathrm{g})$ $\Delta {\mathrm{H}}^{\circ }=-146\mathrm{kJ}$ (B) ${\mathrm{Na}}_2{\mathrm{SO}}_4(\mathrm{s})+{\mathrm{H}}_2\mathrm{O}(l)$ $\begin{array}{c}⟶2\mathrm{NaOH}(\mathrm{s})+{\mathrm{SO}}_3(\mathrm{g})\\ \Delta {\mathrm{H}}^{\circ }=+418\mathrm{kJ}\end{array}$ (C) $2{\mathrm{Na}}_2\mathrm{O}(\mathrm{s})+2{\mathrm{H}}_2(\mathrm{g})⟶4\mathrm{Na}(\mathrm{s})+2{\mathrm{H}}_2\mathrm{O}(l)$ $\Delta {\mathrm{H}}^{\circ }=+259\mathrm{kJ}$