Gas A reacts with gas B in a sealed vessel. Experiments P and Q each start with 5.0 g of gas A and the same amount of gas B, which is enough for gas B to remain in excess throughout. One experiment uses a vessel with a volume of 1.0 dm31.0\,\mathrm{dm^{3}}1.0dm3 and the other uses a vessel with a volume of 2.0 dm32.0\,\mathrm{dm^{3}}2.0dm3. All other conditions are identical.
| Time in s | Mass of gas A used up in P in g | Mass of gas A used up in Q in g |
|---|---|---|
| 0 | 0.0 | 0.0 |
| 20 | 3.8 | 1.9 |
| 40 | 5.0 | 3.2 |
| 60 | 5.0 | 4.3 |
| 80 | 5.0 | 5.0 |
Explain which experiment used the 1.0 dm31.0\,\mathrm{dm^{3}}1.0dm3 vessel and why the mass of gas A used up eventually became the same in both experiments.
122 exam-style questions on Edexcel GCSE Chemistry 8.1 Rates of reaction, covering 8.1.1 Measuring and interpreting rates of reaction, 8.1.2 Collision theory and the factors affecting rate, and 8.1.3 Catalysts and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.