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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

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

1. ### Calculate the equilibrium Constant of the following reaction:2NO + 2H2 ---> N2 + 2H2O.Where N2 = 0.019 MH2O = 0.12 MNO = 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

The equilibrium Constant Kc = 6777.64.

2. ### Calculate the equilibrium Constant of the following reaction:H2 + I2 ---> 2 HIwhere 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