Consider the following thermochemical equations at : (1) (2) What is the enthalpy change,

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

Problem

Consider the following thermochemical equations at 25 ∘ ⁣C25\,^\circ\!\text{C}: (1) C(s)+O2(g)→CO2(g)\text{C}(s) + \text{O}_2(g) \rightarrow \text{CO}_2(g) ΔH1=−394 kJ\Delta H_1 = -394\,\text{kJ} (2) CO(g)+12 O2(g)→CO2(g)\text{CO}(g) + \tfrac{1}{2}\,\text{O}_2(g) \rightarrow \text{CO}_2(g) ΔH2=−283 kJ\Delta H_2 = -283\,\text{kJ} What is the enthalpy change, ΔH\Delta H, for the reaction C(s)+12 O2(g)→CO(g)\text{C}(s) + \tfrac{1}{2}\,\text{O}_2(g) \rightarrow \text{CO}(g)? (a) +111 kJ+111\,\text{kJ} (b) −252.5 kJ-252.5\,\text{kJ} (c) −111 kJ-111\,\text{kJ} (d) −677 kJ-677\,\text{kJ}

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