Data for two reactions are given per mole of product formed

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

Data for two reactions are given per mole of product formed. 1. S(s)+O2(g)→SO2(g)\text{S}(s) + \text{O}_2(g) \rightarrow \text{SO}_2(g) ΔH1=−297.0 kJ mol−1\Delta H_1 = -297.0\,\text{kJ mol}^{-1} 2. SO2(g)+12 O2(g)→SO3(g)\text{SO}_2(g) + \tfrac{1}{2}\,\text{O}_2(g) \rightarrow \text{SO}_3(g) ΔH2=−99.0 kJ mol−1\Delta H_2 = -99.0\,\text{kJ mol}^{-1} What is the enthalpy change, in kilojoules, for producing 2.00 mol2.00\,\text{mol} of SO3(g)\text{SO}_3(g) from elemental sulfur and oxygen? (a) −396 kJ-396\,\text{kJ} (b) −792 kJ-792\,\text{kJ} (c) +792 kJ+792\,\text{kJ} (d) −693 kJ-693\,\text{kJ}

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