How many atoms are present in one mole of a substance?

• A. 6.022 × 10^{23}
• B. 3.01 × 10^{23}
• C. 1.00 × 10^{6}
• D. 6.022 × 10^{22}

Answer: (A)

Verified step by step guidance

1. Understand that one mole of any substance contains a specific number of particles (atoms, molecules, ions, etc.), which is a fundamental constant in chemistry known as Avogadro's number.
2. Recall the value of Avogadro's number, which is the number of atoms or particles in exactly one mole of a substance. This number is approximately \$6.022 \times 10^{23}$.
3. Recognize that this constant allows chemists to count particles by weighing macroscopic amounts of material, linking the microscopic scale to the macroscopic scale.
4. Identify that the question asks for the number of atoms in one mole, so the answer corresponds directly to Avogadro's number without any additional calculations.
5. Conclude that the correct choice is the value of Avogadro's number, \$6.022 \times 10^{23}$ atoms per mole.