The following table lists the van der Waals a parameters for HCl, CH₃CN, Ne, and CH₄. Without referring to Table 3E.1, use your knowledge of the factors governing the magnitudes of a to assign each of these four gases to its a value. Explain your reasoning.

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a/(bar L² mol ²) Substance 17.813 ? 3.700 ? 2.303 ? 0.208 ?