What is the significance of Avogadro's number? Avogadro's number is the number of -

• A. grams in one mole of a substance
• B. particles in one mole of a substance
• C. atoms in one gram of hydrogen
• D. electrons in one atom of carbon

Answer: (B)

Verified step by step guidance

1. Understand that Avogadro's number is a fundamental constant in chemistry that relates the microscopic scale (atoms, molecules, particles) to the macroscopic scale (moles).
2. Recall that one mole of any substance contains exactly the same number of elementary entities (atoms, molecules, ions, or particles), which is Avogadro's number.
3. Recognize that Avogadro's number is approximately \$6.022 \times 10^{23}$ and represents the number of particles in one mole of a substance.
4. Note that Avogadro's number is not related to the mass in grams directly, nor to the number of electrons in an atom or atoms in a gram of hydrogen.
5. Therefore, the significance of Avogadro's number is that it defines the number of particles contained in one mole of any substance.