Write the equilibrium constant expressions for the following reactions.
` N_2 O_4 g hArr 2NO_2 (g)`

Explanation

To write the equilibrium constant expressions for the reaction \( N_2O_4(g) \rightleftharpoons 2NO_2(g) \), we follow these steps:

### Step 1: Identify the reaction components
The reaction involves one reactant, \( N_2O_4 \), and one product, \( NO_2 \).

### Step 2: Write the general form of the equilibrium constant expression
The equilibrium constant expression \( K \) is given by the formula:
\[
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