For reduction of ferric oxide by hydrogen, \( \mathrm{Fe}_{2} \mathrm{O}_{3}(\mathrm{~s})+3 \mat...

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For reduction of ferric oxide by hydrogen, \( \mathrm{Fe}_{2} \mathrm{O}_{3}(\mathrm{~s})+3 \mathrm{H}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{Fe}(\mathrm{s})+3 \mathrm{H}_{2} \mathrm{O}(\square) \);
\( \Delta \mathrm{H}^{\circ}{ }_{300}=-26.72 \mathrm{~kJ} \). The reaction was found to be too exothermic. To be convenient, it is desirable that \( \Delta \mathrm{H}^{0} \) should be at the most \( -26 \mathrm{~kJ} \). At what temperature difference it is possible ?
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