A reversible reaction is used to make substance B.
A(g)⇌2B(g)A(\text{g}) \rightleftharpoons 2B(\text{g})A(g)⇌2B(g)
The change from left to right takes in energy.
The equilibrium yield of B was measured under three sets of conditions. The other conditions were kept constant for each measurement.
| Temperature | Pressure | Equilibrium yield of B |
|---|---|---|
| 500 °C | 50 kPa | 47% |
| 500 °C | 100 kPa | 38% |
| 600 °C | 100 kPa | 55% |
Explain why 600 °C and 100 kPa gives a greater equilibrium yield of B than 500 °C and 50 kPa.
Use the equation and the data in your answer.
109 exam-style questions on AQA GCSE Chemistry 6.2 Reversible reactions and dynamic equilibrium, covering 6.2.1 Reversible reactions, 6.2.2 Energy changes and reversible reactions, 6.2.3 Equilibrium, 6.2.4 The effect of changing conditions on equilibrium, 6.2.5 The effect of changing concentration, 6.2.6 The effect of temperature changes on equilibrium, and 6.2.7 The effect of pressure changes on equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.