A process uses this reaction to recover copper from copper(II) oxide.
CuO+H2→Cu+H2O\mathrm{CuO + H_2 \rightarrow Cu + H_2O}CuO+H2→Cu+H2O
Copper is the desired product.
Mr M_r\,Mr values: Cu=63.5\mathrm{Cu} = 63.5Cu=63.5, H2O=18.0\mathrm{H_2O} = 18.0H2O=18.0
The theoretical yield of copper is 50.0 kg in each trial.
| Trial | Actual yield of copper in kg |
|---|---|
| 1 | 38.0 |
| 2 | 44.0 |
Calculate the percentage yield of copper for each trial.
Calculate the atom economy for making copper in this reaction.
A student says, ‘Collecting more copper in Trial 2 means the atom economy of the reaction has increased.’
Explain whether the student is correct.
152 exam-style questions on OCR GCSE Chemistry 5.1 Monitoring chemical reactions, covering 5.1.1 The technique of titration, 5.1.2 Theoretical mass, percentage yield and atom economy, 5.1.3 Concentration of a solution in mol/dm3, 5.1.4 Concentration calculations and titration results, 5.1.5 Molar gas volume and volumes of gases in reactions, and 5.1.6 Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.