Sulfuryl chloride decomposes in a sealed reaction vessel.
SO2Cl2(g)⇌SO2(g)+Cl2(g) \mathrm{SO_{2}Cl_{2}(g) \rightleftharpoons SO_{2}(g) + Cl_{2}(g)} SO2Cl2(g)⇌SO2(g)+Cl2(g)The reaction mixture takes in energy when sulfuryl chloride decomposes.
Four experiments start with the same amount of sulfuryl chloride.
| Set of conditions | Temperature (°C) | Pressure (atm) |
|---|---|---|
| W | 200 | 5 |
| X | 200 | 60 |
| Y | 450 | 5 |
| Z | 450 | 60 |
Under which set of conditions is the equilibrium percentage of sulfur dioxide greatest?
Write the letter.
Explain why the temperature in your answer to (a) gives the greatest percentage of sulfur dioxide.
Explain why the pressure in your answer to (a) gives the greatest percentage of sulfur dioxide.
Some sulfuryl chloride is removed from an equilibrium mixture while the temperature and pressure are kept constant.
Predict how the position of equilibrium changes. Explain your answer.
Chlorine is injected into the vessel at unchanged temperature and pressure. State how the amount of sulfuryl chloride changes as equilibrium is restored.
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.