At 450 K the equilibrium constant for the homogeneous reaction H _ 2 (g)+ I _ 2 (g) 2…
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 K the equilibrium constant for the homogeneous reaction
H2(g)+I2(g)⇌2HI(g)
is Kc=50.0. A reaction vessel at 450 K is charged with the following initial concentrations:
[H2]=0.20 M, [I2]=0.10 M, [HI]=2.00 M.
(a) Calculate the reaction quotient Qc for the mixture immediately after it is prepared.
(b) State the direction in which the net reaction must proceed to reach equilibrium.
(c) Briefly explain how the value of Qc relative to Kc leads to the prediction you made in part (b).