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Ch.3 - Molecules and Compounds
Tro - Chemistry: A Molecular Approach 5th Edition
Tro5th EditionChemistry: A Molecular ApproachISBN: 9780134874371Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoTro 5th EditionCh.3 - Molecules and CompoundsProblema 74
Capitolo 3, Problema 74

Iron in the earth is in the form of iron ore. Common ores include Fe2O3 (hematite), Fe3O4 (magnetite), and FeCO3 (siderite). Calculate the mass percent composition of iron for each of these iron ores. Which ore has the highest iron content?

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1
Identify the chemical formula of each iron ore: Fe2O3, Fe3O4, and FeCO3.
Calculate the molar mass of each compound using the atomic masses: Fe (55.85 g/mol), O (16.00 g/mol), and C (12.01 g/mol).
Determine the total mass of iron in one mole of each compound by multiplying the number of iron atoms by the atomic mass of iron.
Calculate the mass percent composition of iron in each ore using the formula: (mass of iron in the compound / molar mass of the compound) * 100%.
Compare the mass percent compositions to determine which ore has the highest iron content.

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Mass Percent Composition

Mass percent composition is a way to express the concentration of an element in a compound as a percentage of the total mass of that compound. It is calculated by dividing the mass of the element by the total mass of the compound and multiplying by 100. This concept is essential for determining how much of a specific element, like iron, is present in various iron ores.
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Mass Percent Calculation

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all the atoms in a chemical formula. Understanding molar mass is crucial for calculating mass percent composition, as it provides the necessary total mass of the compound for the calculations.
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Molar Mass Concept

Chemical Formula Interpretation

Interpreting chemical formulas involves understanding the ratios of different elements in a compound. For example, in Fe2O3, there are two iron (Fe) atoms and three oxygen (O) atoms. This knowledge is vital for calculating the mass percent of iron in each ore, as it allows for the correct identification of the number of iron atoms relative to the total mass of the compound.
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Intepreting the Band of Stability
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