AP Chemistry
7.10 Reaction Quotient and Le Châtelier’s Principle
7.3 Reaction Quotient and Equilibrium Constant
At a certain temperature, the equilibrium constant \(K_c\) for the reaction represented below is \(15\).
\[\text{PCl}_3(g) + \text{Cl}_2(g) \rightleftharpoons \text{PCl}_5(g)\]
A student injects \(0.20\text{ mol}\) of \(\text{PCl}_3(g)\), \(0.20\text{ mol}\) of \(\text{Cl}_2(g)\), and \(0.40\text{ mol}\) of \(\text{PCl}_5(g)\) into an evacuated, rigid \(2.0\text{ L}\) container at this temperature. Which of the following correctly predicts how the concentration of \(\text{PCl}_5(g)\) will change as the system approaches equilibrium, and provides the correct justification?
\[\text{PCl}_3(g) + \text{Cl}_2(g) \rightleftharpoons \text{PCl}_5(g)\]
A student injects \(0.20\text{ mol}\) of \(\text{PCl}_3(g)\), \(0.20\text{ mol}\) of \(\text{Cl}_2(g)\), and \(0.40\text{ mol}\) of \(\text{PCl}_5(g)\) into an evacuated, rigid \(2.0\text{ L}\) container at this temperature. Which of the following correctly predicts how the concentration of \(\text{PCl}_5(g)\) will change as the system approaches equilibrium, and provides the correct justification?
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