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what is the equillibrium constant of each of the substance in the equillibrium when concentration of ICl was 0.75M 2ICl(g)=I2+Cl2

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    You haven't stated the problem very clearly. I assume you mean the equilibrium "concentrations" and not equilibrium constants. You have the Kc given in the problem. Also, I assume that 0.75M is (ICl) initially and not at equilibrium.
    ..........2ICl ==>I2 + Cl2

    Substitute the E line nto the Kc expression and solve for x.

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