(a) 1 (b) 2 (c) 1 (d) 3
Work Step by Step
(a) In one mole of FeO, we have 1 mole of iron. (b) In Fe$_2$O$_3$, we have 2 moles of iron. (c) In Fe(OH)$_3$, we have 1 mole of iron. (d) In Fe$_3$O$_4$, we have 3 moles of iron.
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