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Ch.3 - Chemical Reactions and Reaction Stoichiometry
Brown - Chemistry: The Central Science 15th Edition
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Tutti i libri di testoBrown 15th EditionCh.3 - Chemical Reactions and Reaction StoichiometryProblema 42b
Capitolo 3, Problema 42b

A sample of the male sex hormone testosterone, C19H28O2, contains 3.88×1021 hydrogen atoms. (b) How many molecules of testosterone does it contain?

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Identify the number of hydrogen atoms in one molecule of testosterone, which is given by the chemical formula \( \text{C}_{19}\text{H}_{28}\text{O}_{2} \). This indicates there are 28 hydrogen atoms per molecule.
Use the given number of hydrogen atoms, \( 3.88 \times 10^{21} \), and divide it by the number of hydrogen atoms per molecule (28) to find the number of testosterone molecules.
Set up the division: \( \frac{3.88 \times 10^{21}}{28} \).
Perform the division to calculate the number of testosterone molecules.
The result from the division will give you the number of testosterone molecules in the sample.

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Avogadro's Number

Avogadro's number, approximately 6.022 x 10^23, is the number of atoms, ions, or molecules in one mole of a substance. This constant is crucial for converting between the number of particles and the amount of substance in moles, allowing chemists to relate macroscopic quantities to microscopic entities.
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Avogadro's Law

Molecular Formula

The molecular formula of a compound indicates the number and type of atoms present in a molecule. For testosterone, C19H28O2 signifies that each molecule contains 19 carbon atoms, 28 hydrogen atoms, and 2 oxygen atoms. Understanding the molecular formula is essential for determining the number of molecules from the total number of atoms.
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Determining Molecular Formulas

Stoichiometry

Stoichiometry is the branch of chemistry that deals with the quantitative relationships between the reactants and products in a chemical reaction. In this context, it helps in calculating the number of molecules of testosterone based on the total number of hydrogen atoms, using the ratio of hydrogen atoms per molecule as defined by its molecular formula.
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Stoichiometry Concept
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