Which of the following reactions is predicted to yield the smallest amount of product…

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

Problem

Which of the following reactions is predicted to yield the smallest amount of product at equilibrium at 400 K? (a) CO2(g)+H2(g)⇋CO(g)+H2O(g),  Kc=3.6×10−1\mathrm{CO_2(g)+H_2(g)\leftrightharpoons CO(g)+H_2O(g)},\;K_c = 3.6 \times 10^{-1} (b) 2 NO(g)⇋N2(g)+O2(g),  Kc=1.2×10−30\mathrm{2\,NO(g)\leftrightharpoons N_2(g)+O_2(g)},\;K_c = 1.2 \times 10^{-30} (c) H2(g)+I2(g)⇋2 HI(g),  Kc=5.0×102\mathrm{H_2(g)+I_2(g)\leftrightharpoons 2\,HI(g)},\;K_c = 5.0 \times 10^{2} (d) N2(g)+3 H2(g)⇋2 NH3(g),  Kc=6.0×105\mathrm{N_2(g)+3\,H_2(g)\leftrightharpoons 2\,NH_3(g)},\;K_c = 6.0 \times 10^{5}

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