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For the following reaction, Kc = 255 at 1000 K. CO (g) + Cl2 (g) ⇌...

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Chemistry

For the following reaction, Kc = 255 at 1000 K. CO (g) + Cl2 (g)⇌ COCl2 (g) A reaction mixture initially contains a COconcentration of 0.1550 M and a Cl2 concentration of 0.171 M at1000 K. What is the equilibrium concentration of CO at 1000 K. Whatis the equilibrium concentration of Cl2 at 1000 K? What is theequilibrium concentration of COCl2 at 1000 K? Express all answersto three significant figures

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4.0 Ratings (710 Votes)

                                CO (g)     +        Cl2 (g)      ⇌ COCl2 (g)       Kc = 255

Initial                      0.1555                0.171                  0

at equilibrium            0.1555 -x         0.171-x                 x

      Kc = [COCl2]/ [CO] [Cl2]

      255 = x / (0.1555-x) (0.171-x)

   255 x2 - 84.2575 x + 6.78 = 0

   On solving,   x = 0.1386 M

Therefore, equilibrium concentrations are

   [CO] = 0.1555 -x = 0.1555 -0.1386 = 0.0169 M

    [Cl2] = 0.171 - x = 0.171 - 0.1386 = 0.0324 M

[COCl2] = 0.1386 M
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