For the gas-phase equilibrium 2 , NO _2(g) N _2 O _4(g) H^ = -57

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 gas-phase equilibrium 2 NO2(g)⇌N2O4(g)ΔH∘=−57 kJ2\,\text{NO}_2(g) \rightleftharpoons \text{N}_2\text{O}_4(g) \qquad \Delta H^{\circ}= -57\,\text{kJ} a sample is at equilibrium at 298 K. The temperature is then lowered to 273 K. Which of the following most accurately describes both the shift in equilibrium position and the resulting change in the value of the equilibrium constant KK? (a) The equilibrium shifts toward NO2_2, and KK decreases. (b) The equilibrium shifts toward N2_2O4_4, and KK increases. (c) The equilibrium shifts toward N2_2O4_4, and KK decreases. (d) The equilibrium shifts toward NO2_2, and KK remains unchanged.

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