The mole
I can describe what a mole is and its link with the Avogadro constant.
The mole
I can describe what a mole is and its link with the Avogadro constant.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Chemical amounts are measured in moles (mol).
- One mole of particles of a substance is defined as the Avogadro constant number of particles.
- The number of particles (atoms, ions, molecules etc.) in one mole of a substance is always the same.
- Use of Avogadro's number to calculate the number of particles of substance when number of moles is known and vice versa.
- The mass of one mole of a monatomic element is equal to the relative atomic mass of that element measured in grams.
Keywords
Mole - A mole of something is 6.02 × 10²³ of it. The mass of a mole of a substance is its relative mass expressed in grams.
Relative formula mass - The relative formula mass (RFM) of a substance is the sum of the relative atomic masses of all the atoms in a formula.
Avogadro's constant - Avogadro's constant is the number of particles in one mole of a substance (6.02 × 10²³ mol⁻¹)
Common misconception
The number one mole represents can be difficult for pupils to grasp and appreciate.
Show many real world examples of 6.02 × 10²³ examples of something - that many basketballs would form a planet the size of the Earth.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
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Starter quiz
6 Questions
a substance made up of only one type of atom
two more or elements chemically bonded together
a particle with an electrical charge due to the gain/loss of electrons
a particle consisting of two or more atoms joined by covalent bonds
two atoms chemically bonded together
Exit quiz
6 Questions
atom
molecule
molecule
formula unit
formula unit
atom
6 g of carbon
62 g of phosphorus
30 g of neon
84 g silicon
35 g of nitrogen