Chemistry · GCSE · Quantitative Chemistry

Using moles to balance equations

Using moles to balance equationsFree4:43Heddy Score 3 of 7, below the standard
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What you need to know

  • One mole of any element is its relative atomic mass in grams, and it always contains the same very large number of atoms.
  • Number of moles = mass in grams ÷ relative atomic mass.
  • Worked examples: 48 g of magnesium (Ar 24) is 2 mol, and 252 g of iron (Ar 56) is 4.5 mol.
  • Converting masses into moles is the first step towards working out balancing numbers from reacting masses.

In this clip

Runs 4:43, from 0:08 to 4:51 of the full video.

Heddy Score3/7, Below the standard
See the seven stars
  • Trusted source · passed. The creator's own upload, live and playable here.
  • On the map · not judged yet. A teacher watched it: it mainly teaches this map topic.
  • Spec-true · not judged yet. Accurate, and right for the current UK specification.
  • Focused · passed. One idea, short enough to watch in one go.
  • Accessible · passed. Good captions, clear sound and pictures.
  • Safe for children · not judged yet. Right for 11 to 16 year olds, with no sales pitch.
  • Proven · not judged yet. Earned from our students: they learn from it, find it helpful and watch it to the end.
★ passed · ☆ pending · ✕ failed
Our students

Not enough students yet

Our own students' answers. These are what move ★7 Proven.
On YouTube

1.21M views · 18.8K likes · Freesciencelessons 995K subscribers

As reported by YouTube on 2026-11-02. Not part of the Heddy Score.
How the Heddy Score works

Why we picked it

A clear, exam-board-aligned introduction to the mass ÷ relative atomic mass calculation that underpins balancing equations from masses.

Freesciencelessons on YouTubechecked 2026-10-22

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