Study Notes on Moles and Avogadro's Number

Definition of a Mole

  • 1 mole is defined as the quantity of a substance that contains as many elementary entities (e.g., atoms, molecules) as there are in 12 grams of carbon-12.

Moles and Atoms

  • 1 mole of an element is equal to Avogadro's number of atoms of that element.

  • Avogadro's number is approximately 6.022×10236.022 \times 10^{23} atoms.

Special Name for Avogadro's Number

  • The number mentioned in the definition (question 1) has a special name. It is called Avogadro's number or Avogadro constant.

  • This number allows chemists to count particles by weighing them, thus bridging the gap between the atomic and macroscopic worlds.