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Equilibrium Constant Calculator
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Let us apply law of mass action to a reversible reaction at equilibrium :
A + B --> C + D
From this we get chemical equilibrium.
Using this, we get Equilibrium Constant Kc is given as:
Kc = $\frac{[C]^{c}[D]^{d}}{[A]^{a}[B]^{b}}$
where [A],[B] are the molar concentrations of reactant A and B and [C], [D] are the molar concentrations of products C and D.

Equilibrium Constant Calculator calculates the equilibrium constant Kc if Molar concentration of reactants and products are given.
 

Steps for Equilibrium Constant Calculator

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Step 1 :  

Read the problem and the given reaction and observe whether the reactants and products concentration are given.



Step 2 :  

Using the formula


Kc = $\frac{[C]^{c}[D]^{d}}{[A]^{a}[B]^{b}}$


Apply the given quantities in this formula, we get the required equilibrium constant.



Problems on Equilibrium Constant Calculator

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  1. Calculate the equilibrium Constant of the following reaction:
    2NO + 2H2 ---> N2 + 2H2O.

    Where N2 = 0.019 M
    H2O = 0.12 M
    NO = 0.158 M
    H2 = 0.010 M.


    Step 1 :  

    givenreaction is 2NO + 2H2 ---> N2 + 2H2O.


    Where N2 = 0.019 M
    H2O = 0.12 M
    NO = 0.158 M
    H2 = 0.010 M.



    Step 2 :  

    Using the formula


    Kc = $\frac{[C]^{c}[D]^{d}}{[A]^{a}[B]^{b}}$


         = $\frac{[0.019][0.12]}{[0.058]^{2}[0.010]^{2}}$


         = 6777.64



    Answer  :  

    The equilibrium Constant Kc = 6777.64.



  2. Calculate the equilibrium Constant of the following reaction:

    H2 + I2 ---> 2 HI
    where H2 = 0.5 M,
    I2 = 0.4 M,
    HI = 3 M


    Step 1 :  

    Given reaction is:


    H2 + I2 ---> 2 HI
    where H2 = 0.5 M,
    I2 = 0.4 M,
    HI = 3 M



    Step 2 :  

    Using the formula


    Kc = $\frac{[C]^{c}[D]^{d}}{[A]^{a}[B]^{b}}$


         = $\frac{[3]^{2}}{[0.5][0.4]}$


         = 45



    Answer  :  

    The equilibrium Constant of the given reaction is Kc = 45.



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