Calculate the standard enthalpy change,

CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics

Problem

\Delta H^\circ_{298}

, for the reaction

2\text{SO}_2(g)+\text{O}_2(g)\rightarrow2\text{SO}_ზად3(g)

using the following standard enthalpies of formation:

\Delta H_f^\circ(\text{SO}_2,g)=-296.8\,\text{kJ mol}^{-1}

and

\Delta H_f^\circ(\text{SO}_3,g)=-395.7\,\text{kJ mol}^{-1}

. Report your answer in kJ to the nearest kJ.