Iron in the earth is in the form of iron ore. Common ores include Fe2 O3 (hematite), Fe3 O4 (mag

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Iron in the earth is in the form of iron ore. Common ores...

Iron in the earth is in the form of iron ore. Common ores include $\mathrm{Fe}_{2} \mathrm{O}_{3}$ (hematite), $\mathrm{Fe}_{3} \mathrm{O}_{4}$ (magnetite), and FeCO$_{3}$ (siderite). Calculate the mass percent composition of iron for each of these iron ores. Which ore has the highest iron content?

Key Concepts

Mass Percent Composition

Mass percent composition is the percentage by mass of a particular element in a compound relative to the total mass of the compound. This concept is fundamental in determining how much of each element is present in a material, and it is calculated by dividing the total mass of the element in the compound by the compound’s overall molecular mass and then multiplying by 100.

Molar Mass Calculation

Molar mass calculation involves adding together the atomic masses of all atoms that make up a compound as indicated by its chemical formula. This step is essential because it provides the total mass of one mole of the compound, which is then used as the denominator in calculating the mass percent composition.

Chemical Formula Interpretation

Chemical formula interpretation is the process of analyzing a compound’s formula to determine the types and numbers of atoms present. This understanding is crucial for accurately calculating both the individual element masses and the total molar mass, which form the basis for any percentage composition calculations.

Stoichiometry

Stoichiometry is the branch of chemistry that deals with the quantitative relationships between the amounts of reactants and products in a chemical reaction or, in composition analysis, the ratios of elements within a compound. It involves using the counts of atoms derived from the chemical formula to ensure accurate calculations of mass contributions for each element.

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