(Solved): 3. Use the thermochemical equations shown below to determine the enthalpy for the reaction: (5 mark ...

3. Use the thermochemical equations shown below to determine the enthalpy for the reaction: (5 marks) \[ \mathrm{SO}_{2(g)} \rightarrow \mathrm{S}_{(\mathrm{s})}+\mathrm{O}_{2(g)} \] \[ \begin{array}{ll} \mathrm{H}_{2} \mathrm{~S}_{(g)}+3 / 2 \mathrm{O}_{2(g)} \rightarrow \mathrm{H}_{2} \mathrm{SO}_{3(1)} & \Delta \mathrm{H}^{\circ}=-306 \mathrm{KJ} \\ \mathrm{H}_{2} \mathrm{SO}_{3(j)} \rightarrow \mathrm{H}_{2} \mathrm{O}_{(1)}+\mathrm{SO}_{2(g)} & \Delta \mathrm{H}^{\circ}=93 \mathrm{KJ} \\ \mathrm{H}_{2} \mathrm{~S}_{(g)}+1 / 2 \mathrm{O}_{2(g)} \rightarrow \mathrm{S}_{(\mathrm{s})}+\mathrm{H}_{2} \mathrm{O}_{(1)} & \Delta \mathrm{H}^{\circ}=-232.5 \mathrm{KJ} \end{array} \]