The endothermic equilibrium N _2 O _4(g) 2 NO _2(g) is established at

CHEMISTRY · Single correct · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)

Problem

The endothermic equilibrium N2O4(g)⇌2NO2(g)\text{N}_2\text{O}_4(g)\rightleftharpoons 2\text{NO}_2(g) is established at 350 K350\,\text{K}. Initial equilibrium concentrations are [N2O4]=0.020 M[\text{N}_2\text{O}_4]=0.020\,\text{M} and [NO2]=0.040 M[\text{NO}_2]=0.040\,\text{M}. After a single disturbance, the system reaches a new equilibrium with [N2O4]=0.015 M[\text{N}_2\text{O}_4]=0.015\,\text{M} and [NO2]=0.050 M[\text{NO}_2]=0.050\,\text{M}. Which change is most consistent with these observations? (a) Some NO2(g)\text{NO}_2(g) was removed from the vessel (b) The temperature of the system was increased (c) Additional N2O4(g)\text{N}_2\text{O}_4(g) was injected into the vessel (d) The volume of the container was increased at constant temperature

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