AP Chemistry
7.10 Reaction Quotient and Le Châtelier’s Principle
7.9 Introduction to Le Châtelier’s Principle
7.3 Reaction Quotient and Equilibrium Constant
A student investigates the gas-phase decomposition of phosphorus pentachloride inside a cylinder fitted with a movable piston at a constant temperature \(T\). The system initially reaches chemical equilibrium according to the equation below.
\[ \text{PCl}_5(g) \rightleftharpoons \text{PCl}_3(g) + \text{Cl}_2(g) \]
The initial equilibrium state corresponds to an equilibrium constant \(K_p\). The piston is quickly pulled outward so that the volume of the container triples at constant temperature. Immediately after this expansion, before any chemical reaction occurs, what is the value of the ratio \(\dfrac{Q_p}{K_p}\)?
\[ \text{PCl}_5(g) \rightleftharpoons \text{PCl}_3(g) + \text{Cl}_2(g) \]
The initial equilibrium state corresponds to an equilibrium constant \(K_p\). The piston is quickly pulled outward so that the volume of the container triples at constant temperature. Immediately after this expansion, before any chemical reaction occurs, what is the value of the ratio \(\dfrac{Q_p}{K_p}\)?
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