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let the oxidation number of Fe is x
then, 3x + 4(-2) = 0
x = + 8/3
hence, the average oxidation number of Fe is +8/3, but stoichiometrically, Fe₃O₄ is an equimolar mixture of FeO and Fe₂O₃.
The oxidation number of Fe in FeO is +2
and the oxidation number of Fe in Fe₂O₃ is +3
then, 2x + x = +6 + 2 = +8 ⇒ x = +8/3
Bronze is an alloy made of copper and another metal, usually tin. Compositions vary, but most modern bronze is 88% copper and 12% tin. Bronze may also contain manganese, aluminum, nickel, phosphorus, silicon, arsenic, or zinc.
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