The elementary reaction is carried out in a closed vessel at constant temperature

CHEMISTRY · Single correct · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)

Problem

The elementary reaction A⇌B\text{A} \rightleftharpoons \text{B} is carried out in a closed vessel at constant temperature. The measured forward and reverse reaction rates are listed in the table. Time (min) | rfwdr_{\text{fwd}} (mol L−1 s−1)(\text{mol L}^{-1}\,\text{s}^{-1}) | rrevr_{\text{rev}} (mol L−1 s−1)(\text{mol L}^{-1}\,\text{s}^{-1}) 0 | 2.4 | 0.0 2 | 1.2 | 0.80 4 | 0.90 | 0.90 6 | 0.90 | 0.90 At which recorded time does the system first reach dynamic equilibrium? (a) 6 min6\ \text{min} (b) 4 min4\ \text{min} (c) 2 min2\ \text{min} (d) 0 min0\ \text{min}

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