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An oxide of iron has the formula Fe3O4. What mass percent of iron does it contain?

Question:

An oxide of iron has the formula Fe3O4. What mass percent of iron does it contain?

Mass Percent:

Mass percent represents the contribution of an element to the total mass of the molecule. For example, H{eq}_2 {/eq}O has two atoms of hydrogen and one atom of oxygen. While it would be tempting to say hydrogen contributes 2/3 of the mass, the small size of hydrogen and the larger size of oxygen actually means that hydrogen, even with two atoms, contributes 2/18 or 11.11 percent of the total mass of the molecule.

Answer and Explanation: 1

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The mass percent of iron in an oxide of iron with the formula Fe{eq}_3 {/eq}O{eq}_4 {/eq} is 72.359 percent.

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Calculating Percent Composition and Determining Empirical Formulas

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Chapter 9 / Lesson 7
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What is percent composition? Learn how to find the percent composition of compounds. See how to determine the empirical formula from percent composition.


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