A sealed vessel at constant temperature contains the reaction
CHEMISTRY · Single correct · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)
Problem
A sealed vessel at constant temperature contains the reaction
N2(g)+3H2(g)⇌2NH3(g).
At a particular instant the reaction quotient Q is found to be greater than the equilibrium constant K. Which of the following best describes how the partial pressures of the species will change as the system approaches equilibrium?
(a) pNH3 will decrease, while pN2 and pH2 will increase.
(b) pNH3 will increase, while pN2 and pH2 will decrease.
(c) All partial pressures will remain unchanged because the system is already at equilibrium.
(d) pNH3 will decrease, pN2 will decrease, and pH2 will increase.