CHEMISTRY · Single correct · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)
Problem
Which statement best describes the effect, if any, on the numerical value of the equilibrium constant Kp for the reaction
PCl5(g)⇌PCl3(g)+Cl2(g)
when 0.50atm of helium is injected into the rigid reaction vessel at constant temperature?
(a) Kp increases because the total pressure increases.
(b) Kp remains unchanged because it depends only on temperature.
(c) Kp decreases because the partial pressures of the reacting gases decrease.
(d) Kp remains unchanged because the inert gas does not participate in the reaction, although the equilibrium position shifts.