---
title: "Avogadro's Number — AP Chem Definition & Exam Guide"
description: "Avogadro's number (6.022 × 10²³ mol⁻¹) converts moles to particles in AP Chem. See how it powers mole calculations in Unit 1 and stoichiometry in Unit 4."
canonical: "https://fiveable.me/ap-chem/key-terms/avogadros-number"
type: "key-term"
subject: "AP Chemistry"
---

# Avogadro's Number — AP Chem Definition & Exam Guide

## Definition

Avogadro's number, also known as Avogadro's constant, represents the number of atoms or molecules in one mole of any substance. It’s approximately 6.022 x 10^23 particles per mole.

## Related Study Guides

- [1.2 Mass Spectra of Elements](/ap-chem/unit-1/mass-spectroscopy-elements/study-guide/B4IVhweYImJO0nU86Kq7)
- [4.5 Stoichiometry](/ap-chem/unit-4/stoichiometry/study-guide/GjwCuhOQRvWLb4rKjYD2)
- [1.1 Moles and Molar Mass](/ap-chem/unit-1/moles-molar-mass/study-guide/U0wdfzbGXdkv2l1LVdqP)

## Review

### Related Terms

- [Mole](/ap-chem/key-terms/mole): A unit in chemistry representing Avogadro's number worth of particles (atoms, molecules, ions etc.)
- Atoms/Molecules/Ions: These are basic units that make up matter; atoms form molecules and ions are charged atoms or groups of atoms.
- [Stoichiometry](/ap-chem/key-terms/stoichiometry): The part of chemistry dealing with quantitative relationships between reactants and products in chemical reactions; often involves calculations using moles and Avogadro’s number.