$\overline{){\mathbf{mass}}{\mathbf{}}{\mathbf{percent}}{\mathbf{=}}\frac{\mathbf{mass}\mathbf{}\mathbf{component}}{\mathbf{total}\mathbf{}\mathbf{mass}}{\mathbf{\times}}{\mathbf{100}}}$

Assuming a 100 g sample:

For Fe_{2}O_{3}:

$\mathbf{mass}\mathbf{}\mathbf{Fe}\mathbf{=}\mathbf{100}\mathbf{}\overline{)\mathbf{g}\mathbf{}{\mathbf{Fe}}_{\mathbf{2}}{\mathbf{O}}_{\mathbf{3}}}\left(\frac{1\overline{)\mathrm{mol}{\mathrm{Fe}}_{2}{O}_{3}}}{159.69\overline{)g{\mathrm{Fe}}_{2}{O}_{3}}}\right)\left(\frac{2\overline{)\mathrm{mol}\mathrm{Fe}}}{1\overline{)\mathrm{mol}{\mathrm{Fe}}_{2}{O}_{3}}}\right)\left(\frac{55.845g\mathrm{Fe}}{1\overline{)\mathrm{mol}\mathrm{Fe}}}\right)\mathbf{=}$**69.94 g Fe**

Iron is mined from the earth as iron ore. Common ores include Fe_{2} O_{3} (hematite), Fe_{3} O_{4} (magnetite), and FeCO_{3} (siderite).

Calculate the mass percent composition of iron for Fe_{2}O_{3} (hematite).

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