Table 4.3 compares the van der Waals (1873), Redlich–Kwong (1949), and Peng–Robinson (1976) equations of state in similar forms. Based on intermolecular interactions, qualitatively analyze how the progression of equations may have given more accurate results.

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TABLE 4.3 Parameters for Some Popular Cubic Equations of State of the Form P = RT/(vb) - Attr Equation van der Waals Redlich-Kwong Soave-Redlich-Kwong Peng-Robinson Year 1873 1949 1972 1976 Attr a a/VT v (v + b) ax (T) v (v + b) aaT v(v + b) + b(v - b)