At 700 K the equilibrium constant for the reaction is

CHEMISTRY · Single correct · AP · Chemistry · Equilibrium · Equilibrium

Problem

At 700 K the equilibrium constant KcK_c for the reaction N2(g)+3H2(g)  ⇌  2NH3(g)\text{N}_2(g)+3\text{H}_2(g)\;\rightleftharpoons\;2\text{NH}_3(g) is 4.5×10−34.5\times10^{-3}. A 1.00 L vessel is charged with 0.2000.200 mol N2\text{N}_2, 0.6000.600 mol H2\text{H}_2, and 0.0500.050 mol NH3\text{NH}_3 and immediately sealed. Assuming ideal behavior, in which direction will the net reaction initially proceed to reach equilibrium? (a) Toward formation of more NH3\text{NH}_3 (shift right). (b) The mixture is already at equilibrium; no net change will occur. (c) Toward formation of more N2\text{N}_2 and H2\text{H}_2 (shift left). (d) The direction cannot be predicted without additional information about reaction rates.

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