4.21 When studying the surface activity of acetic acid solutions at 20 °C, the following results were obtained:
acid concentration, mol/l 0.00 0.03 0.25 0.80 1.20
σ•103, N/m 73.25 69.00 64.40 58.85 56.49
Calculate the adsorption values and areas occupied by one molecule of acetic acid at various concentrations.

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