The van der Waals equation is given by:
\[ P + \frac{an^2}{V^2} = nRT \]
where:
- \( P \) is the pressure,
- \( a \) is a constant that depends on the gas (for \( Cl_2 \), \( a = 6.343 \, \text{bar L}^2 \, \text{mol}^{-2} \)),
- \( n \) is the number of moles of
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