Particles from Moles (Avogadro's Number)

Also known as avogadro's number · atoms from moles

N = n\,N_A

N =

n =

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Constant used — built into this formula, no need to enter

N_{\mathrm{A}} = 6.02214076 \times 10^{23}\ \text{mol}^{-1}

Avogadro constant · exact

Learning zone

A mole is nothing more mysterious than a count, the chemist's dozen: multiply moles by the Avogadro constant and you have the literal number of atoms, molecules, or ions in hand. Since the 2019 SI redefinition NA is exact by decree — 6.02214076 × 10²³ per mole — so a 2.0 mol sample contains exactly 1.204428152 × 10²⁴ particles, no measurement uncertainty involved.

Particles from Moles (Avogadro's Number)

N = n\,N_A

Where

$N$ = Number of particles
$n$ = Amount of substance

Missing one of these? Work it out first, then come back

Number of particles — Specific Gravity, Radioactive Activity (A = λN)
Amount of substance — Moles from Mass (n = m/M), Heat of Reaction

Part of this formula set

Stoichiometry basics

5 formulasThe conversions every mass-to-mass calculation runs through — moles from grams, particles from moles, gas volume, composition and yield.