Nitrogen monoxide reacts reversibly with chlorine to form nitrosyl chloride.
2NO(g)+Cl2(g)⇌2NOCl(g) \mathrm{2NO(g) + Cl_{2}(g) \rightleftharpoons 2NOCl(g)} 2NO(g)+Cl2(g)⇌2NOCl(g)The forward reaction is exothermic.
Reaction mixtures with the same initial proportions of nitrogen monoxide and chlorine are allowed to reach equilibrium in sealed vessels. The table shows the conditions and equilibrium yields for three experiments.
| Experiment | Temperature / °C | Pressure / kPa | Equilibrium yield of nitrosyl chloride / % |
|---|---|---|---|
| B | 450 | 100 | 49 |
| C | 350 | 500 | 84 |
| D | 450 | 500 | not measured |
Predict the equilibrium yield in experiment D compared with experiments B and C. Explain your predictions.
124 exam-style questions on OCR GCSE Chemistry 5.3 Equilibria, covering 5.3.1 Reversible reactions and dynamic equilibrium and 5.3.2 Changing the position of equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.