Answer
$FeO(s)+2HClO_4(aq)\longrightarrow Fe(ClO_4)_2(aq)+H_2O(l)$
Work Step by Step
$FeO(s)+2HClO_4(aq)\longrightarrow Fe(ClO_4)_2(aq)+H_2O(l)$ is balanced with two moles $HClO_4$.
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