Given the following data at 298 K:

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

Problem

Given the following data at 298 K: (i) S(s)+O2(g)→SO2(g)\mathrm{S(s)+O_2(g)\rightarrow SO_2(g)} ΔS298∘=+11.6  J mol−1 K−1\Delta S^{\circ}_{298}=+11.6\;\text{J\,mol}^{-1}\,\text{K}^{-1} (ii) 2 SO3(g)→2 SO2(g)+O2(g)\mathrm{2\,SO_3(g)\rightarrow 2\,SO_2(g)+O_2(g)} ΔS298∘=+257  J mol−1 K−1\Delta S^{\circ}_{298}=+257\;\text{J\,mol}^{-1}\,\text{K}^{-1} Calculate ΔS298∘\Delta S^{\circ}_{298} for the reaction 2 S(s)+3 O2(g)→2 SO3(g)\mathrm{2\,S(s)+3\,O_2(g)\rightarrow 2\,SO_3(g)}.

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