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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).

2 answers

For Fe2O3.
(2*atomic mass Fe/molar mass Fe2O3)*100 = ?
The others are done the same way.
115.6789
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