Find the work performed by one mole of a Van der Walls gas during its isothermal expansion from the volume `V_1` to `V_2` at a temperature `T`.

Explanation

To find the work performed by one mole of a Van der Waals gas during its isothermal expansion from volume \( V_1 \) to \( V_2 \) at a temperature \( T \), we can follow these steps:

### Step 1: Write the Van der Waals Equation
The Van der Waals equation for one mole of gas is given by:

\[ \left( P + \frac{a}{V^2} \right) (V - b) = RT \]
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