An agricultural cooperative requires 46 kg of a fertiliser additive for a field trial. Three suppliers each offer to make one batch using a different reaction.
Each supplier has the stated total mass of reactants available. The reactants are present in the proportions required by the balanced equation. Only pure, dry fertiliser additive from the batch counts towards the order.
| Supplier | Mass of reactants available / kg | Atom economy / % | Percentage yield / % |
|---|---|---|---|
| P | 80 | 75 | 80 |
| Q | 70 | 90 | 70 |
| R | 60 | 80 | 95 |
Which supplier can provide the complete order from one batch?
Supplier P
No supplier
Supplier R
Supplier Q
151 exam-style questions on Edexcel GCSE Chemistry 6.2 Quantitative analysis, covering 6.2.1 Concentration in mol dm⁻³ and titration calculations, 6.2.2 Percentage yield and why actual yield falls short, 6.2.3 Atom economy of a reaction, 6.2.4 Choosing a reaction pathway, and 6.2.5 Molar volume of gases and Avogadro's law. Each one has a worked solution and a mark scheme showing where the marks go.