A product is made in batches. Each batch uses the same mass of reactants. The plant runs one batch after another, 24 hours a day.
The table shows the percentage yield and the time for one batch at four different temperatures.
| Temperature (∘C^\circ\mathrm{C}∘C) | Percentage yield (%) | Time for one batch (hours) |
|---|---|---|
| 300 | 60 | 8 |
| 350 | 52 | 4 |
| 400 | 45 | 3 |
| 450 | 35 | 2.5 |
Which temperature makes the greatest mass of product per day?
300 ∘C^\circ\mathrm{C}∘C
350 ∘C^\circ\mathrm{C}∘C
400 ∘C^\circ\mathrm{C}∘C
450 ∘C^\circ\mathrm{C}∘C
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.