Estimate the Minimum Temperature at Which Magnetite Can Be Reduced $\rightarrow$

question 46

Multiple Choice

Estimate the minimum temperature at which magnetite can be reduced to iron by graphite.
Fe₃O₄(s) + 2C(s) $\rightarrow$ 2CO₂(g) + 3Fe(s)
$\Delta$ S_r ^$\omicron$ = +351.44 kJ.mol^-1
The standard molar enthalpies of formation of magnetite and CO₂(g)
Are -1118.4 and -393.51 kJ.mol^-1 ,Respectively.

• A) 670^\(\omicron\)C
• B) Magnetite cannot be reduced by carbon at any temperature.
• C) 787^\(\omicron\)C
• D) 943^\(\omicron\)C
• E) 1790^\(\omicron\)C

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