AP Chemistry
7.10 Reaction Quotient and Le Châtelier’s Principle
7.9 Introduction to Le Châtelier’s Principle
The synthesis of ammonia gas is represented by the following equation:
\[\text{N}_2\text{(g)} + 3\,\text{H}_2\text{(g)} \rightleftharpoons 2\,\text{NH}_3\text{(g)} \quad \Delta H^\circ = -92.2\text{ kJ/mol}_{\text{rxn}}\]
A mixture of \(\text{N}_2\text{(g)}\), \(\text{H}_2\text{(g)}\), and \(\text{NH}_3\text{(g)}\) is initially at equilibrium in a cylinder fitted with a movable piston at \(450\text{ K}\). The temperature of the system is increased to \(550\text{ K}\). Which of the following correctly predicts the effect of the temperature increase on the value of the equilibrium constant, \(K_p\), and identifies a change in container volume that will shift the equilibrium position toward the products?
\[\text{N}_2\text{(g)} + 3\,\text{H}_2\text{(g)} \rightleftharpoons 2\,\text{NH}_3\text{(g)} \quad \Delta H^\circ = -92.2\text{ kJ/mol}_{\text{rxn}}\]
A mixture of \(\text{N}_2\text{(g)}\), \(\text{H}_2\text{(g)}\), and \(\text{NH}_3\text{(g)}\) is initially at equilibrium in a cylinder fitted with a movable piston at \(450\text{ K}\). The temperature of the system is increased to \(550\text{ K}\). Which of the following correctly predicts the effect of the temperature increase on the value of the equilibrium constant, \(K_p\), and identifies a change in container volume that will shift the equilibrium position toward the products?
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