# Problem: Iron is mined from the earth as iron ore. Common ores include Fe2 O3 (hematite), Fe3 O4 (magnetite), and FeCO3 (siderite).Calculate the mass percent composition of iron for Fe3O4 (magnetite).

###### FREE Expert Solution

First, we need to get the atomic weights of each element in Fe3O4 using the periodic table and then calculate its molar mass.

molar mass Fe = 55.84 g/mol

molar mass O = 16.00 g/mol

molar mass Fe3O4 = (55.84 g/mol x 3) + (16.00 g/mol x 4)

79% (462 ratings) ###### Problem Details
Iron is mined from the earth as iron ore. Common ores include Fe2 O3 (hematite), Fe3 O4 (magnetite), and FeCO3 (siderite).

Calculate the mass percent composition of iron for Fe3O4 (magnetite).

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