Avogadro's number — Science definition
The exact entity count per mole, 6.02214076×10²³; the Avogadro constant carries unit mol⁻¹.
Where it is taught
- The Mole & Molar Mass — Reactions, Moles & Composition, Physical Science: Chemistry, Grade 11
In use
02214076 × 10²³ specified entities by the SI definition, you multiply moles by Avogadro's number to get the number of representative particles — atoms, molecules, or formula units — and you divide by it to go back.
The Mole & Molar Mass
Questions using avogadro's number
Problem 1
Avogadro's number — the number of representative particles in one mole — is approximately…
- 6.022 × 10²³
- 3.14 × 10⁰
- 1.602 × 10⁻¹⁹
- 9.81 × 10⁰
Answer and explanation
6.022 × 10²³
One mole is defined as 6.022 × 10²³ particles.
Problem 2
How many molecules are in 2.00 mol of carbon dioxide? (Avogadro's number = 6.022 × 10²³ per mole.)
Answer and explanation
1.2044e+24 molecules
molecules = moles × Avogadro's number = 2.00 × 6.022 × 10²³ = 1.2044 × 10²⁴ molecules.