For the exothermic reaction

K = 0.160 at a certain temperature.
A flask is charged with 0.507 bar PCl3 , 0.507 bar Cl2, and 0.304 bar PCl5 at this temperature.

What are the equilibrium partial pressures of PCl3 , Cl2, and PCl5, respectively?

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  1. I assume that is Kp that is 0.160. First, you must determine which way the rxn moves; i.e., to the left or to the right. Do that with Qsp. Plug in the values and I get Qsp = about 1.2 which means the rxn will reach equilibrium by moving to the left.

    ...........PCl3 + Cl2 ⇌ PCl5

    Plug the E line into the Kp expressdion and solve for p, then evaluate the E line for individual values.

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