For the Equilibrium PCl₅(g) $\rightleftharpoons$ PCl₃(g) + Cl₂(g), K_c = 2

question 62

Multiple Choice

For the equilibrium PCl₅(g) $\rightleftharpoons$ PCl₃(g) + Cl₂(g) , K_c = 2.0 × 10¹ at 240°C. If pure PCl₅ is placed in a 1.00-L container and allowed to come to equilibrium, and the equilibrium concentration of PCl₃(g) is 0.50 M, what is the equilibrium concentration of PCl₅(g) ?

• A) 1 M
• B) 0.25 M
• C) 0.025 M
• D) 0.012 M
• E) 6.3 M

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