A chemist is planning a preparation of sodium bromide.
The balanced equation for the process is:
2Na + Br₂ → 2NaBr
The chemist has the following quantities available.
| Reactant | Mass (g) |
|---|---|
| Sodium, Na | 3.45 |
| Bromine, Br₂ | 16.0 |
| Element | Relative atomic mass (Aᵣ) |
|---|---|
| Na | 23.0 |
| Br | 79.9 |
Identify which reactant runs out first, and work out the greatest mass of sodium bromide the chemist can make from these quantities.
Give your answer to 3 significant figures.
Maximum mass of sodium bromide = ............... g
134 exam-style questions on OCR GCSE Chemistry 3.1 Introducing chemical reactions, covering 3.1.1 Writing formulae and balanced chemical equations, 3.1.2 Formulae of compounds from ions, and state symbols, 3.1.3 Conservation of mass and observed changes in mass, 3.1.4 Half equations and balanced ionic equations, 3.1.5 The mole and the Avogadro constant, and 3.1.6 Stoichiometry, limiting reactants and reacting masses. Each one has a worked solution and a mark scheme showing where the marks go.