A manufacturer must supply at least 1000 kg of chemical X from one 8-hour production shift. The raw materials used by both routes are expensive.
| Route | Theoretical mass of X made in one shift / kg | Percentage yield / % | Atom economy / % | By-product |
|---|---|---|---|---|
| R | 1100 | 85 | 90 | Fed back into the process |
| S | 1500 | 70 | 62 | Treated as waste |
Calculate the mass of pure, dry chemical X expected to be recovered from each route in one shift.
Evaluate which route the manufacturer should use to complete the order.
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.