Hemoglobin, a protein in red blood cells, carries O2 from the lungs to the body's cells. Iron (a

step 1 So we are given the hemoglobin containing iron 2. So for the mass percentage for iron 2, specifi

Hemoglobin, a protein in red blood cells, carries O2 from...

Hemoglobin, a protein in red blood cells, carries $\mathrm{O}_{2}$ from the lungs to the body's cells. Iron (as ferrous ion, Fe $^{2+} )$ makes up 0.33 mass $\%$ of hemoglobin. If the molar mass of hemoglobin is $6.8 \times 10^{4} \mathrm{g} / \mathrm{mol},$ how many $\mathrm{Fe}^{2+}$ ions are in one molecule?

Key Concepts

Avogadro's Number

Avogadro's Number, approximately 6.022 × 10^23, is the number of particles (atoms, ions, or molecules) in one mole of a substance. This fundamental constant allows chemists to convert between the number of moles and the actual number of discrete entities in a given sample.

Stoichiometry

Stoichiometry involves the quantitative relationships between reactants and products in a chemical reaction. It utilizes molar mass, mass percent composition, and Avogadro's Number to perform conversions between mass, moles, and the number of particles, enabling calculations of the amount of a particular atom or ion within a molecule.

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole. It connects the macroscopic mass measured in the laboratory to the number of molecules or atoms in a sample, allowing for conversions between mass and the number of discrete particles using the concept of moles.

Mass Percent Composition

Mass percent composition is the percentage by mass of a certain element in a compound. This concept is used to determine how much mass of an element is present in a given mass of a compound, which is critical when calculating the number of atoms or ions contributed by that element in a molecule.

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