The mole (RAM 1 d.p.)
I can describe what a mole is and its link with the Avogadro constant.
The mole (RAM 1 d.p.)
I can describe what a mole is and its link with the Avogadro constant.
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.
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.
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)
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).
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
6.0 g of carbon
62.0 g of phosphorus
30.3 g of neon
237.0 g selenium
35.0 g of nitrogen