The Mole

Counting by weighing

An interactive lesson with 7 steps, about 6 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• A mole is 6.022 × 10²³ particles.
• Molar mass in g/mol = sum of the atoms’ relative masses (H 1, C 12, O 16).
• moles = mass ÷ molar mass; equal moles mean equal numbers.

Steps

1. Counting by the scoop
2. Molar mass
3. Equal numbers
4. How many moles?
5. Light molecules
6. A gram of water
7. Atoms in a diamond