Valuable minerals (chemicals) can be obtained from ores, which are natually occuring mixtures. One ore cotains 38% magnetite, a mineral with the chemical formual Fe3O4. Fe3O4 contains 72.4% iron. What mass of ore (in tons) would contain 3.5 tons of iron? (Hint: your mass percent conversion factors can have units of tons)

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".