At the equilibrium constant for the reaction is

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

Problem

At 600 K600\,\text{K} the equilibrium constant KpK_p for the reaction CO(g)+H2O(g) ⇌ CO2(g)+H2(g)\mathrm{CO(g)+H_2O(g)\,\rightleftharpoons\,CO_2(g)+H_2(g)} is 5.05.0. The reaction is exothermic with ΔH∘=−41 kJ mol−1\Delta H^{\circ}=-41\,\text{kJ\,mol}^{-1}. A sealed vessel at 600 K600\,\text{K} contains each gas at an initial partial pressure of 0.200 atm0.200\,\text{atm}. The temperature is then increased to 650 K650\,\text{K}. Using R=8.314 J mol−1 K−1R=8.314\,\text{J\,mol}^{-1}\,\text{K}^{-1}, calculate the new equilibrium constant at 650 K650\,\text{K}, compute the reaction quotient QQ using the original partial pressures, and state whether the system will shift toward reactants or products as it re-equilibrates.

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