Write the unit of van der Waal constant which represent the magnitude of attractive forces between gas molecules.

Explanation

To find the unit of the van der Waals constant \( A \), which represents the magnitude of attractive forces between gas molecules, we can start by analyzing the van der Waals equation:

\[ \left( P + \frac{A n^2}{V^2} \right) (V - nB) = nRT \]

### Step 1: Identify the relevant terms
In this equation:
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