The gaseous reaction has

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

Problem

The gaseous reaction X(g)⇌Y(g)\mathrm{X(g) \rightleftharpoons Y(g)} has ΔH∘=+45 kJ mol−1\Delta H^\circ = +45\,\text{kJ\,mol}^{-1}. Rank the magnitude of the equilibrium constant KK at 200 K, 298 K, and 400 K from smallest to largest, and justify your ranking in one sentence.

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