At a certain temperature the following equilibria are established

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

Problem

At a certain temperature the following equilibria are established. 1. NO(g)+12 O2(g)  ⇌  NO2(g)\mathrm{NO}(g)+\dfrac{1}{2}\,\mathrm{O_2}(g)\;\rightleftharpoons\;\mathrm{NO_2}(g) K1=1.0×105K_1 = 1.0\times10^{5} 2. 2 NO2(g)  ⇌  N2O4(g)2\,\mathrm{NO_2}(g)\;\rightleftharpoons\;\mathrm{N_2O_4}(g) K2=3.0×102K_2 = 3.0\times10^{2} Determine the equilibrium constant for the overall reaction 2 NO(g)+O2(g)  ⇌  N2O4(g)2\,\mathrm{NO}(g)+\mathrm{O_2}(g)\;\rightleftharpoons\;\mathrm{N_2O_4}(g) at this temperature. (a) 1×10101\times10^{10} (b) 9×1099\times10^{9} (c) 3×10123\times10^{12} (d) 3×10113\times10^{11}

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