Copper is recovered by heating copper(II) oxide with carbon.
2CuO+C→2Cu+CO2 \mathrm{2CuO + C \rightarrow 2Cu + CO_2} 2CuO+C→2Cu+CO2The reaction goes to completion.
| Reactant | Mass |
|---|---|
| Copper(II) oxide | 15.9 g |
| Carbon | 1.80 g |
| Element | Relative atomic mass (ArA_rAr) |
|---|---|
| C | 12.0 |
| O | 16.0 |
| Cu | 63.5 |
Calculate the mass of copper formed and the mass and name of the reactant left over after the reaction.
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.