Question

Iron can be extracted from haematite, Fe2O3, using either C or CO2 as the reducing agent. The reactions are shown below.

Fe2 O3 (s) + 3 C(s) → 2 Fe(s) + 3 CO(g) ΔH = +492.7 kJ /mol Fe2 O3 (s) + 3 CO(g) → 2 Fe(s) + 3 CO2 (g) ΔH = - 24.8 kJ/mol Substance S° (J/ K·mol) Fe2 O 3 (s) 87.4 Fe (s) 27.3 C (s) 5.7 CO (g) 197.6 CO 2 (g) 213.6 Use available data given to:

1. Calculate the minimum temperature at which reduction with carbon is feasible

2. Prove by calculation that reduction with carbon monoxide is feasible at all temperatures.

Answer 1

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