A sealed vessel initially contains ,

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

Problem

A sealed vessel initially contains [N2]=1.00 M[\text{N}_2]=1.00\,\text{M}, [H2]=1.50 M[\text{H}_2]=1.50\,\text{M}, and no NH3\text{NH}_3. After the system reaches equilibrium at a certain temperature, the concentration of NH3\text{NH}_3 is found to be 0.40 M0.40\,\text{M} for the reaction N2(g)+3 H2(g)⇌2 NH3(g).\text{N}_2(g)+3\,\text{H}_2(g)\rightleftharpoons 2\,\text{NH}_3(g). What is the value of the equilibrium constant KcK_c at this temperature? (a) 0.69 (b) 0.27 (c) 3.6 (d) 0.22

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