A company can make the same product by four different reaction pathways. The table shows the atom economy and percentage yield of each pathway.
| Pathway | Atom economy (%) | Percentage yield (%) |
|---|---|---|
| 1 | 100 | 45 |
| 2 | 60 | 90 |
| 3 | 90 | 55 |
| 4 | 80 | 70 |
The reactants are always mixed in the amounts shown by the balanced equation.
Which pathway makes the greatest mass of desired product from 100 g of reactants?
Pathway 1
Pathway 2
Pathway 3
Pathway 4
57 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.