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Pure PCl5 is placed in a rigid flask so that its pressure at 250 °C is 2.000 bar. The gas slowly decEquilibrium Chemistry Question

Question

Pure PCl5 is placed in a rigid flask so that its pressure at 250 °C is 2.000 bar. The gas slowly decomposes to PCl3 and Cl2 at this temperature, and the partial pressure of Cl2 is eventually 0.814 bar. What is the value of Kp for the reaction?
PCl5(g) ⇌ PCl3(g) + Cl2(g) Kp = ???

A.

0.559

✓ Correct
B.

0.686

C.

0.814

D.

1.78

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