The mole and Avogadro constant
The key idea
The mole connects the microscopic world of atoms and molecules to measurable laboratory amounts. One mole contains exactly the Avogadro constant number of specified entities.
Why it matters
It is chemistry’s counting unit: like a dozen, but designed for unimaginably small objects.
A useful mental picture
It is chemistry’s counting unit: like a dozen, but designed for unimaginably small objects.