For equilibrium `AB(g) iff A(g) + B(g), K_p` is equal to four times the total pressure. Calculate the number of moles of B formed.

Explanation

To solve the problem, we will follow these steps:

### Step 1: Write the equilibrium expression
The equilibrium reaction is given as:
\[ AB(g) \rightleftharpoons A(g) + B(g) \]

The equilibrium constant \( K_p \) for this reaction can be expressed as:
\[ K_p = \frac{P_A \cdot P_B}{P_{AB}} \]
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