For the gaseous equilibrium at constant temperature
CHEMISTRY · Single correct · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)
Problem
For the gaseous equilibrium
C(s)+CO2(g)⇌2CO(g)
at constant temperature, the total pressure of the system is suddenly increased by decreasing the volume of the rigid container. Which statement best describes the immediate effect on the position of equilibrium?
(a) The equilibrium shifts toward products because the forward reaction forms more moles of gas.
(b) There is no shift in equilibrium because the presence of a solid prevents pressure from affecting the reaction.
(c) The equilibrium shifts toward reactants because the reverse reaction forms fewer moles of gas.
(d) The value of Kp increases when the pressure rises, so the system shifts toward products to re-establish equilibrium.