Which of the following expressions gives the standard enthalpy change for the…

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

Problem

Which of the following expressions gives the standard enthalpy change ΔHrxn∘\Delta H^\circ_{\text{rxn}} for the reaction 2 SO2(g)+O2(g)⟶2 SO3(g)2\,\mathrm{SO_2(g)} + \mathrm{O_2(g)} \longrightarrow 2\,\mathrm{SO_3(g)} in terms of standard enthalpies of formation, ΔHf∘\Delta H_f^\circ? (a) ΔHrxn∘=[2ΔHf∘(SO2)+ΔHf∘(O2)]−2ΔHf∘(SO3)\Delta H^\circ_{\text{rxn}} = \left[2\Delta H_f^\circ(\mathrm{SO_2}) + \Delta H_f^\circ(\mathrm{O_2})\right] - 2\Delta H_f^\circ(\mathrm{SO_3}) (b) ΔHrxn∘=2ΔHf∘(SO3)−2ΔHf∘(SO2)\Delta H^\circ_{\text{rxn}} = 2\Delta H_f^\circ(\mathrm{SO_3}) - 2\Delta H_f^\circ(\mathrm{SO_2}) (c) ΔHrxn∘=2ΔHf∘(SO3)−[2ΔHf∘(SO2)+ΔHf∘(O2)]\Delta H^\circ_{\text{rxn}} = 2\Delta H_f^\circ(\mathrm{SO_3}) - \left[2\Delta H_f^\circ(\mathrm{SO_2}) + \Delta H_f^\circ(\mathrm{O_2})\right] (d) ΔHrxn∘=ΔHf∘(SO3)−[2ΔHf∘(SO2)+ΔHf∘(O2)]\Delta H^\circ_{\text{rxn}} = \Delta H_f^\circ(\mathrm{SO_3}) - \left[2\Delta H_f^\circ(\mathrm{SO_2}) + \Delta H_f^\circ(\mathrm{O_2})\right]

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