The Effect of Temperature on the Equilibrium Constant of Chemical Reactions
The equilibrium constant, or Kc, is an important concept in the study of chemical reactions. Kc is defined as the ratio of the product of the concentrations of the products to the product of the concentrations of the reactants, each raised to the power of their respective stoichiometric coefficients (Cengel and Boles, 2017). In other words, Kc provides a measure of the relative concentrations of reactants and products when the reaction has achieved equilibrium. The temperature at which the reaction takes place affects the value of Kc, as the ratio of products to reactants changes as the temperature increases (Cengel and Boles, 2017). To demonstrate the effect of temperature on Kc, consider the reaction 2E(g) F(g) + G(g). At 25°C, the equilibrium constant, Kc, for this reaction is 0.04. When a mixture of 0.800 moles of F and 1.200 mole of G in a 2.0-L container is allowed to come to equilibrium, the equilibrium concentration of E in molar is 0.064. This example illustrates that the reaction will not achieve equilibrium until the temperature is consistent with the equilibrium constant, Kc. Cont…
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