STUDENT SPACE · TOPIC 1
Moles, mass and particles
Convert between mass, amount in moles and number of particles.
The essentials
- One mole contains 6.02 × 10²³ specified particles for CIE calculations.
- Name the particles: atoms, molecules, ions or formula units.
- 12 g carbon and 24 g magnesium each contain 1 mol of atoms.
- Molar mass M is the mass of one mole, in g/mol.
Key vocabulary
| English | Chinese |
|---|---|
| mole | 摩尔 |
| molar mass | 摩尔质量 |
| Avogadro constant | 阿伏伽德罗常数 |
Quick practice
How many molecules are in 0.10 mol of any molecular substance?
Need a hint?
Use the relationships above and check particle ratios and units.
Check your reasoning after trying
0.10 × 6.02 × 10²³ = 6.02 × 10²² molecules.
Use Lesson 1 in your worksheet for written practice. Your teacher will discuss those answers in class.