The gaseous reaction 2X(g) ⇌ Y(g) has an equilibrium constant at 450 K
CHEMISTRY · Single correct · A Level · Chemistry · Kinetics · Kinetics
Problem
The gaseous reaction 2X(g) ⇌ Y(g) has an equilibrium constant K=4.0 at 450 K. A mixture is prepared at 450 K with Q=1.5(<K). A solid catalyst specific to this reaction is then introduced.
Which statement best predicts the effect of adding the catalyst on the composition of the mixture after it has returned to equilibrium at 450 K?
(a) The presence of the catalyst will shift the equilibrium toward products, resulting in a larger equilibrium concentration of Y.
(b) The catalyst lowers the activation energy, so the value of K increases and both reactant and product concentrations at equilibrium become larger.
(c) The final equilibrium composition will be identical to the composition that would have been obtained without the catalyst, although it will be reached more quickly.
(d) The catalyst will shift the equilibrium toward reactants because it accelerates the reverse reaction more than the forward reaction.