What is the Kc for this reaction?

Phosphorus pentachloride decomposes to phosphorus trichloride and chlorine gas. A 1.10M sample of PCl5 was placed into a vessel. At equilibrium it was determined that the concentration was 0.33M. What is the Kc for this reaction?

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  • EM
    Lv 7
    8 years ago
    Favorite Answer

    PCl5 <--> PCl3 + Cl2

    Kc = [PCl2][Cl2] / [PCl5]

    PCl5 ... PCl3 ... Cl2

    1.10M ... ... ... ... ... initial

    -x ... ... +x ... .. +x change

    0.33M ... x ... ... x . equilibrium

    1.10M - x = 0.33M

    x = 0.77M

    Kc = (0.77)(0.77) / (0.33)

    Kc = 1.80

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