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What do you mean by equilibrium constant? How its units are determined?

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Answer. Equilibrium constant is a ratio of the product of concentration of products raised to the power of coefficient to the product of concentration of reactants raised to the power of coefficient as expressed in the balanced chemical equation.

Kc

  = Product of concentration of products raised to the power of coefficients

    Product of concentration of reactants raised to the power of coefficients

     Kc has no units in reactions with equal number of moles on both sides of the equation. This is because concentration units cancel out in the expression for kc, e.g. for the reaction

           H2(g) + I2(g) <====> 2HI(g)

           

Kc = [HI(g)]2       Units (mol dm-3)2          

    [H2(g) ] [I2(g)]        (mol dm-3) (mol dm-3)                      

                                  

For reactions in which the number of moles of reactants and product are not equal in the balanced chemical equation, Kc of course, have units, e.g., for the reaction

N2(g) + 3H2(g) <=====>2NH3(g)  

    Kc = [NH3(g)]2 = (mol dm-3)2           

     [H2(g) ] [I2(g)]3    (mol dm-3) (mol dm-3)3

      =    1            = mol dm

        (mol dm-3)
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