For the reaction at

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

Problem

For the reaction 2 HI(g)  ⇌  H2(g)+I2(g)2\,\mathrm{HI}(g)\;\rightleftharpoons\;\mathrm{H_2}(g)+\mathrm{I_2}(g) at 400 K400\,\text{K}, the equilibrium constant is Kc=0.015K_c = 0.015. After the system at equilibrium is subjected to a sudden stress, the following concentration data (in mol\,L−1^{-1}) are recorded.
Time (min)[HI][H2_2][I2_2]
01.200.100.10
11.100.120.12
21.050.130.13
31.020.1350.135
41.020.1350.135
At which recorded time is the mixture closest to equilibrium? (a) 4 min (b) 0 min (c) 1 min (d) 2 min

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