A chemist investigates the oxidation of nitrogen monoxide according to the overall…

CHEMISTRY · Multi-part · A Level · Chemistry · Energetics · Energetics

Problem

A chemist investigates the oxidation of nitrogen monoxide according to the overall equation 2 NO(g)+O2(g)⟶2 NO2(g)2\,\text{NO}(g)+\text{O}_2(g)\longrightarrow 2\,\text{NO}_2(g) The following reactions and molar enthalpy changes are available at the same temperature and pressure. (a) Show, using algebraic manipulation of Reactions 1–3, how to obtain the target equation for the oxidation of nitrogen monoxide. (b) Determine the standard molar enthalpy change, ΔHrxn∘\Delta H_{\text{rxn}}^{\circ}, for the target reaction. Report the value in kJ mol−1\text{kJ}\,\text{mol}^{-1} using the correct sign. (c) Justify why the numerical value obtained in part (b) is independent of the specific reaction pathway that actually occurs in the laboratory.

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