Understanding the Relationship

* Avogadro's Number: One mole of any substance contains 6.022 x 10²³ particles (atoms, molecules, etc.). This number is known as Avogadro's constant.

Calculation

1. Divide by Avogadro's Number: To convert atoms to moles, divide the number of atoms by Avogadro's number.

(1.2 x 10²⁴ atoms He) / (6.022 x 10²³ atoms/mol) = 2.0 moles He

Answer: 1.2 x 10²⁴ atoms of helium is equal to 2.0 moles of helium.