Just as a dozen means 12, a mole is a specific number of particles.
Avogadro's
Constant
\( 6.02
\times 10^{23} \)
particles per mole
The Dozen Analogy
1 dozen eggs = 12 eggs.
1 mole of atoms = 6.02 × 10²³ atoms.
The mole is a counting unit. It lets chemists "count" atoms by weighing them.
The Mole Triangle
m = mass (g)
n = moles (mol)
M = molar mass (g mol⁻¹)
How big is a Mole?
If you had a mole of table tennis balls, they would cover the Earth to a depth of about 300 km.