A particle model represents a reversible reaction in a closed system.
2A(g)+B(g)⇌A2B(g) \mathrm{2A(g) + B(g) \rightleftharpoons A_{2}B(g)} 2A(g)+B(g)⇌A2B(g)The numbers of each type of molecule are recorded at different times.
| Time in seconds | Number of A molecules | Number of B molecules | Number of A2B\mathrm{A_{2}B}A2B molecules |
|---|---|---|---|
| 20 | 36 | 26 | 16 |
| 30 | 28 | not recorded | 20 |
| 40 | 28 | not recorded | 20 |
Use the results to calculate the total number of molecules in the model at equilibrium. Show your working.
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.