\( \mathrm{Fe}_{2} \mathrm{O}_{3}(s) \) may be converted to \( \mathrm{Fe} \) by the reaction \[...

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\( \mathrm{Fe}_{2} \mathrm{O}_{3}(s) \) may be converted to \( \mathrm{Fe} \) by the reaction
\[
\mathrm{Fe}_{2} \mathrm{O}_{3}(s)+3 \mathrm{H}_{2}(g) \rightleftharpoons 2 \mathrm{Fe}(s)+3 \mathrm{H}_{2} \mathrm{O}(g)
\]
for which \( K_{c}=8 \) at temp. \( 720^{\circ} \mathrm{C} \).
What percentage of the \( \mathrm{H}_{2} \) remains unreacted after the reaction has come to equilibrium?
(a) \( =22 \% \)
(b) \( =34 \% \)
\( (c) \simeq 66 \% \)
(d) \( =78 \% \)
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