A chemist monitors the forward and reverse reaction rates for the gaseous…
CHEMISTRY · Multi-part · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)
Problem
A chemist monitors the forward and reverse reaction rates for the gaseous decomposition reaction X₂(g) ⇌ 2 X(g) in a constant-volume container at 450 K. The measured rates (in mol L⁻¹ s⁻¹) are listed at 20-s intervals. (a) Using the data below, determine the time at which the system first reaches equilibrium. Explain your reasoning.| time / s | forward rate | reverse rate |
|---|---|---|
| 0 | 1.20 | 0.00 |
| 20 | 0.86 | 0.34 |
| 40 | 0.62 | 0.60 |
| 60 | 0.48 | 0.48 |
| 80 | 0.48 | 0.48 |