Question:

What is the mass of oxygen reacted?

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You heat 3.970 grams of a mixture of Fe3O4 and FeO to form 4.195 grams of Fe2O3. What is the mass of oxygen reacted?

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  1. You know the total mass of stuff that you put in.  You know the total mass that you got out.  The difference must be oxygen picked up in the reaction.

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