For the equilibrium reaction with

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

Problem

For the equilibrium reaction N2(g)+3H2(g)↔2NH3(g)N_2(g)+3H_2(g)\leftrightarrow2NH_3(g) with ΔH=−92 kJ mol−1\Delta H=-92\,\text{kJ mol}^{-1}, explain why lowering the temperature increases the equilibrium mole fraction of NH3NH_3 even though the overall reaction rate decreases.

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