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how many CO would be needed to reduce 19.1 grams of iron (III).

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Fe2O3 + 3CO ==> 3CO2 + 2Fe

mols Fe2O3 = grams/molar mass = ?
Use the coefficients in the balanced equation to convert mols Fe2O3 to mols CO.
Now convert mols CO to grams. grams CO = mols CO x molar mass CO

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