Chemistry

Iron ores have different amounts of iron per kilogram of ore.
Calculate the mass percent composition of iron for each iron ore: Fe2O3{\rm Fe_2O_3} (hematite), Fe3O4{\rm Fe_3O_4} (magnetite), FeCO3{\rm FeCO_3} (siderite).

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  1. For Fe2O3.
    (2*atomic mass Fe/molar mass Fe2O3)*100 = ?
    The others are done the same way.

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  2. 115.6789

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