Consider the following elementary reactions and their enthalpy changes

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

Problem

Consider the following elementary reactions and their enthalpy changes. 1. N2(g)+O2(g)→2 NO(g)\text{N}_2(g) + \text{O}_2(g) \rightarrow 2\,\text{NO}(g) ΔH1=+180.5 kJ\Delta H_1 = +180.5\,\text{kJ} 2. NO(g)+12 O2(g)→NO2(g)\text{NO}(g) + \tfrac{1}{2}\,\text{O}_2(g) \rightarrow \text{NO}_2(g) ΔH2=−57.2 kJ\Delta H_2 = -57.2\,\text{kJ} What is ΔH\Delta H for the reaction N2(g)+2 O2(g)→2 NO2(g)\text{N}_2(g) + 2\,\text{O}_2(g) \rightarrow 2\,\text{NO}_2(g)? (a) −66.1 kJ-66.1\,\text{kJ} (b) +123.3 kJ+123.3\,\text{kJ} (c) +66.1 kJ+66.1\,\text{kJ} (d) −114.4 kJ-114.4\,\text{kJ}

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