The equilibrium expression for a reaction is Kc = x2/V(a - x). What is true for the reaction?
Correct answer: C. Decrease of pressure favors the forward reaction.
- A. Increase of pressure favors the forward reaction.
- B. Decrease of pressure favors the backward reaction.
- C. Decrease of pressure favors the forward reaction.
- D. Increase of volume favors the backward reaction.
Explanation
The volume (V) in the denominator indicates that the number of moles of products is greater than the number of moles of reactants. According to Le Chatelier's principle, decreasing the pressure will favor the side with more moles of gas, which is the forward reaction.
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About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
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