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

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 ^$\circ$ = +351.44 J.K^-1.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 ^$\circ$ C
B) Magnetite cannot be reduced by carbon at any temperature.
C) 787 ^$\circ$ C
D) 943 ^$\circ$ C
E) 1790 ^$\circ$ C

Correct Answer:

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