Consider the reaction at 298 K:

CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics

Problem

Consider the reaction at 298 K: Fe2O3(s)+CO(g)→Fe(s)+CO2(g)\text{Fe}_2\text{O}_3(s) + \text{CO}(g) \rightarrow \text{Fe}(s) + \text{CO}_2(g). Balance the equation using the smallest whole-number coefficients, then determine the standard enthalpy change (in kJ) associated with producing 5.00 g of Fe(s). Standard enthalpies of formation are ΔHf∘(Fe2O3)=−824.2 kJ mol−1\Delta H_f^{\circ}(\text{Fe}_2\text{O}_3) = -824.2\,\text{kJ mol}^{-1}, ΔHf∘(CO)=−110.5 kJ mol−1\Delta H_f^{\circ}(\text{CO}) = -110.5\,\text{kJ mol}^{-1}, ΔHf∘(CO2)=−393.5 kJ mol−1\Delta H_f^{\circ}(\text{CO}_2) = -393.5\,\text{kJ mol}^{-1}, and ΔHf∘(Fe,s)=0\Delta H_f^{\circ}(\text{Fe},s) = 0.

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