Consider a reversible reaction for which the rates of the forward and reverse…

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

Problem

Consider a reversible reaction for which the rates of the forward and reverse reactions vary with time as follows: Time (min): 0 10 20 30 40 Rate_forward (×10⁻² mol L⁻¹ min⁻¹): 9.0 5.6 4.0 3.2 3.0 Rate_reverse (×10⁻² mol L⁻¹ min⁻¹): 0.0 2.4 3.5 3.2 3.4 At which time does the system first reach equilibrium? (a) 20 min (b) 10 min (c) 30 min (d) 40 min

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