Predict and calculate the effect of volume change on an equilibrium system serth

Question

Predict and calculate the effect of volume change on an equilibrium system serthe ebrmenCC CO and C COC12(g)--CO(g) + Cl2(g) K 0.123 at 910 K The reaction is allowed to reach equilibrium in a 6.90-L flask. At equilibrium, COC, 0.318 M. [CO] 0.198 M and [C12] 0.198 M (a) The equilibrium mixture is transferred to a 13.8-L flask. In which direction will the reaction proceed to reach equilibrium? (b) Calculate the new equilibrium concentrations that result when the equilibrium mixture is transferred to a 13.8-L flask. [CoCI2] [CO]- CI

Explanation / Answer

            COCl2(g) <====> CO(g)     +       Cl2(g)   K = 0.123 at 910 k

at equil    0.318 M        0.198 M            0.198 M

after      0.318*6.9/13.8 0.198*6.9/13.8   0.198*6.9/13.8

shifting   = 0.159 M       0.099 M             0.099 M

chnage        -x            +x                  +x

re-established

equilibrium   0.159-x         0.099+x          0.099+x

K = [CO][Cl2]/[COCl2]

0.123 = (0.099+x)^2/(0.159-x)

x = 0.028

at equilibrium,

[COCl2] = 0.159-0.028 = 0.131 M

[co] = x = 0.028 M

[Cl2] = x = 0.028 M

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