For the gaseous equilibrium PCl (g) ⇌ PCl (g) + Cl (g)
CHEMISTRY · Subjective · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)
Problem
For the gaseous equilibrium PCl5(g) ⇌ PCl3(g) + Cl2(g), Kc=0.042 at 473 K. Immediately after a disturbance ( t=0s ) the concentrations are [PCl5] = 0.60 M, [PCl3] = 0.050 M, and [Cl2] = 0.050 M. Sixty seconds later the concentrations are [PCl5] = 0.55 M, [PCl3] = 0.060 M, and [Cl2] = 0.060 M. Describe the direction in which the system shifted during those 60 s, referring to the relative values of Q and K.