Using moles to balance equations

• Using moles to balance chemical equations

  1. Calculate the number of moles of all chemicals involved

  2. Divide all numbers by the smallest number to get the lowest possible ratio

  3. Put the ratios into the balanced equation
• Reactions to balance


  • Hydrogen + Chlorine -> Hydrogen Chloride
  • Aluminium + Iron(II) Oxide -> Aluminium Oxide + Iron
  • Barium Chloride + Aluminium Sulfate -> Barium Sulfate + Aluminium Chloride
• Number of moles


  Mass divided by relative formula mass
• Don't write the number 1 in front of elements in balanced equations
• Using moles to balance chemical equations

  1. Calculate the number of moles of all chemicals involved

  2. Divide all numbers by the smallest number to get the lowest possible ratio

  3. Put the ratios into the balanced equation
• More practice questions on using moles to balance equations available in the Revision workbook
• Reactions to balance


  • Hydrogen + Chlorine -> Hydrogen Chloride
  • Aluminium + Iron(III) Oxide -> Aluminium Oxide + Iron
  • Barium Chloride + Aluminium Sulfate -> Barium Sulfate + Aluminium Chloride
• Number of moles


  Mass divided by relative formula mass
• Don't write the number 1 in front of elements in balanced equations
• More practice questions on using moles to balance equations available in the Revision workbook