A sealed vessel at contains the equilibrium mixture for 2 NOCl (g) 2 NO (g)+ Cl…

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 600 K600\,\text{K} contains the equilibrium mixture for 2NOCl(g)⇌2NO(g)+Cl2(g),ΔH∘=+76 kJ mol−1.2\text{NOCl}(g)\rightleftharpoons 2\text{NO}(g)+\text{Cl}_2(g),\qquad \Delta H^\circ = +76\,\text{kJ\,mol}^{-1}. At 600 K600\,\text{K} the equilibrium constant KpK_p is 2.12.1. After a single disturbance (no change in volume), the system reaches a new equilibrium at the same pressure but now has Kp=0.35K_p=0.35, and analysis shows a higher partial pressure of NOCl\text{NOCl} than before the disturbance. Which change most likely caused the shift to the new equilibrium? (a) The total pressure was increased by halving the volume (b) An inert gas was added at constant volume (c) The temperature of the vessel was decreased (d) The temperature of the vessel was increased

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