Atoms, molecules and stoichiometry

Worked examples (6)

• 1Relative molecular mass of a compound (2 marks)
• 2Formula mass with bracketed ions (2 marks)
• 3Relative formula mass of a hydrate (2 marks)
• 4Ar from a three-isotope spectrum (3 marks)
• 5Identifying an element from formula mass (3 marks)
• 6Comparing percentage composition by mass (4 marks)

Worked examples (6)

• 1Moles from mass (2 marks)
• 2Number of molecules (2 marks)
• 3Counting ions in a compound (3 marks)
• 4Mass from a number of atoms (3 marks)
• 5Counting a specified atom in a compound (4 marks)
• 6Equal masses, unequal atom counts (3 marks)

Worked examples (6)

• 1Formula of an ionic compound (2 marks)
• 2Balancing a combustion equation (2 marks)
• 3Writing an ionic equation (3 marks)
• 4Empirical formula from masses (3 marks)
• 5Molecular formula from % composition + Mr (4 marks)
• 6Finding water of crystallisation (4 marks)

Worked examples (6)

• 1Reacting mass calculation (3 marks)
• 2Moles in a solution (2 marks)
• 3Gas volume by Avogadro's law (3 marks)
• 4Percentage yield (3 marks)
• 5Titration concentration, diprotic acid (4 marks)
• 6Limiting reagent and product mass (4 marks)