1. Write the Balanced Chemical Equation

The balanced chemical equation for the reaction is:

2 NOCl(g) ⇌ 2 NO(g) + Cl₂(g)

2. Write the Equilibrium Expression

The equilibrium constant (K_eq) expression is:

K_eq = ([NO]²[Cl₂]) / [NOCl]²

3. Substitute the Equilibrium Concentrations

We are given:

* [NO] = 0.02 M

* [Cl₂] = 0.01 M

* [NOCl] = 0.04 M (Assuming you meant 0.04 M, not 0.h M)

Substitute these values into the K_eq expression:

K_eq = (0.02² * 0.01) / 0.04²

4. Calculate the Value of K_eq

K_eq = (0.000004) / 0.0016 = 0.0025

Therefore, the value of K_eq for this reaction under the given conditions is 0.0025.