Determine the number of moles of hydrogen atoms in each sample. d. 1.87 mol C₈H₁₈

Verified step by step guidance

1. Identify the chemical formula of the compound, which is \( \text{C}_8\text{H}_{18} \).
2. Determine the number of hydrogen atoms in one molecule of \( \text{C}_8\text{H}_{18} \). There are 18 hydrogen atoms per molecule.
3. Use the given amount of moles of \( \text{C}_8\text{H}_{18} \), which is 1.87 mol.
4. Calculate the total number of moles of hydrogen atoms by multiplying the moles of \( \text{C}_8\text{H}_{18} \) by the number of hydrogen atoms per molecule: \( 1.87 \text{ mol} \times 18 \text{ H atoms/molecule} \).
5. The result will give you the total moles of hydrogen atoms in the sample.

Key Concepts

Moles and Avogadro's Number

A mole is a unit in chemistry that represents 6.022 x 10^23 entities, such as atoms or molecules. This concept is fundamental for quantifying substances in chemical reactions and allows chemists to convert between the mass of a substance and the number of particles it contains.

Molecular Formula

The molecular formula of a compound indicates the number and type of atoms present in a molecule. For example, C8H18 (octane) contains 8 carbon atoms and 18 hydrogen atoms. Understanding the molecular formula is essential for determining the composition of a substance and calculating the number of moles of its constituent atoms.

Stoichiometry

Stoichiometry is the area of chemistry that deals with the relationships between the quantities of reactants and products in chemical reactions. It allows for the calculation of the number of moles of different substances involved in a reaction, which is crucial for solving problems related to chemical quantities, such as finding the number of moles of hydrogen atoms in a given sample.