Final answer:
A mole of any substance contains Avogadro's number (6.02 × 10²³) of representative particles.
Step-by-step explanation:
A mole of any substance contains Avogadro's number (6.02 × 10²³) of representative particles. The representative particle of a substance can be atoms, ions, or molecules. For example, 6.022 x 10²³ atoms of ¹2C isotope is one mole of ¹2C. One mole of a substance is equal to one Avogadro's number of particles.