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April 23, 2014

Homework Help: AP Chemistry

Posted by Gabriella on Friday, August 30, 2013 at 9:32pm.

An ore contains Fe3O4 and no other iron. The iron in a 40.93 gram sample of the ore is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 30.7 grams. What was the percent Fe3O4 in the sample of ore?
Answer in units of %

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