K. Sato, F.R. Eirich, and J.E. Mark (J. Polymer Sci., Polym. Phys. 14, 619 (1976)) have reported the data in the table below for the osmotic pressures of polychloroprene (ρ = 1.25 g cm⁻³) in toluene (ρ = 0.858 g cm⁻³) at 30°C. Determine the molar mass of polychloroprene and its second osmotic virial coefficient.

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c/(mg cm-³) II/(N m²) 1.33 30 2.10 51 4.52 132 7.18 246 9.87 390