At 250ºC, the Equilibrium Constant K_p for the Reaction PCl₅(g) $\rightleftharpoons$

question 56

Multiple Choice

At 250ºC, the equilibrium constant K_p for the reaction PCl₅(g) $\rightleftharpoons$ PCl₃(g) + Cl₂(g) is 1.80. Sufficient PCl₅ is put into a reaction vessel to give an initial pressure of 2.74 atm at 250ºC. Calculate the pressure of PCl₅ after the system has reached equilibrium.

• A) 1.50 atm
• B) 1.24 atm
• C) 4.24 atm
• D) 0.94 atm
• E) 1.12 atm

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