# Types of Equilibrium

There are two kinds of chemical equilibrium such as homogeneous equilibrium in which all the reactants and products are in the same phase and heterogeneous equilibrium in which reactants and products are in different phases.

To illustrate the concentration of the reactants and products at equilibrium two examples are given below:

(i) Synthesis of nitric oxide:

The synthesis of NO from $N_2 \text{and} O_2$ may be given as:

$\overset{a}{\underset{a- x} N_2} + \underset{b- x}{\overset{b} O_2} \leftrightharpoons \underset{2x}{\overset{0} 2NO}^{\text{(Initial molar conc.)}}_{(\text{Equilibrium molar conc.)}}$

Where ‘a’ and ‘b’ are the number of moles/litre of the reactants $N_2 \text{and} O_2$ initially respectively.

Let x be the degree of dissociation of NO, i. e. , fraction of substance dissociated the equilibrium molar concentration will be (a-x) and (b-x) moles/litre of the $N_2 \text{and} O_2$ respectively.

(ii) Dissociation of $NH_3$:

The dissociation of NH3 into N2 and H2 may be given as:

Where ‘a’ is the concentration of $NH_3$ in mole per litre initially. Let x be the degree of dissociation of $NH_3$ , thus at equilibrium the concentration of $NH_3 , N_2 \text{and} H_2$ becomes (a – x), x/2 and 3x/2 mole/litre respectively.

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