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This question requires you to balance chemical reactions.
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First know how to write a chemical reaction based on information provided, balance the chemical reaction, and then use the stoichiometric coefficients in order to determine the amount of one thing from the amount of another thing.
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We are attempting to determine the amount of oxygen that is consumed per one mole of feco3, but there's two different chemical reactions.
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One is feco3 reacts with oxygen to make the product fe203 plus carbon dioxide.
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For this one, to balance it, we recognize that we have two irons and one iron, so we're going to put a two there.
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Now we just introduce two carbons, so we're going to put a two there.
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Now we balance our oxygens.
00:52
We have a total of four plus three, that gives us seven, and two times three that's six, plus two, so that's eight.
01:01
So we need to put a one half right there, so we just add one more and we get seven on both sides...