At 298 K the following equilibrium constants are reported

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

Problem

At 298 K the following equilibrium constants are reported. I. N2O4(g)⇋2 NO2(g)\mathrm{N_2O_4(g) \leftrightharpoons 2\,NO_2(g)} Kc=4.6×10−3K_c = 4.6 \times 10^{-3} II. 2 SO2(g)+O2(g)⇋2 SO3(g)\mathrm{2\,SO_2(g)+O_2(g) \leftrightharpoons 2\,SO_3(g)} Kc=9.1×105K_c = 9.1 \times 10^{5} III. CO(g)+12 O2(g)⇋CO2(g)\mathrm{CO(g)+\tfrac12\,O_2(g) \leftrightharpoons CO_2(g)} Kc=2.3×1015K_c = 2.3 \times 10^{15} Which order ranks the three reactions from greatest to least extent of completion toward products? (a) II>III>I\text{II} > \text{III} > \text{I} (b) III>II>I\text{III} > \text{II} > \text{I} (c) III>I>II\text{III} > \text{I} > \text{II} (d) II>I>III\text{II} > \text{I} > \text{III}

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