At 450 °C the nitrogen fixation reaction N (g) + 3 H (g) ⇌ 2 NH (g) has an…
CHEMISTRY · Multi-part · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)
Problem
At 450 °C the nitrogen fixation reaction
N2(g) + 3 H2(g) ⇌ 2 NH3(g)
has an equilibrium constant Kc=0.060.
A 5.00 L reaction vessel at 450 °C contains the following initial molar concentrations:
[N2] = 0.20 M, [H2] = 0.60 M, and [NH3] = 0.10 M.
(1) Calculate the reaction quotient Qc for the initial mixture, showing all work.
(2) Compare Qc with Kc and predict the direction in which the reaction will proceed as the system moves toward equilibrium. Explain your reasoning.