The equilibrium constant Kp is 0.0121, for the reaction: PCl5 (g) PCl3 (g) + Cl2 (g) A vessel is charged with PCl5, giving an initial pressure of 0.123 atm. At equilibrium, the partial pressure of PCl3 is __________ atm. A) 0.078  B) 0.045  C) 0.033  D) 0.123  E) 0.090

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