Fine iron wire (Fe) burns in O2 to form ferric oxide. Write a balanced equation of the reaction.?

Question

With a balanced equation where there is only "one" product, how many moles of oxygen2 are needed to produce 3.91 moles of Iron(111) oxide?

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Answer 1

OK, with iron, there are two ionic forms, ferrIC and ferrOUS. As you have noted, the "IC" has a +3 charge.
So 4 Fe + 3O2 -> 2Fe2O3

Now the ratio of oxygen to ferric oxide by moles is 3 to 2. Then by proportion 3/2 = x/3.91or
11.73 = 2x and x = 5.86 moles O2. TA DA

Answer 2

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