4. For a heptanoic acid solution at a temperature of 293 K, the pressure drop required to force bubbles through a capillary into these solutions was measured. The results are given in the table.
C, mol/l 0.0 0.16 0.25 0.32 0.51 0.80 1.00
b, mJ/m2 72.75 69.7 67.0 65.3 61.8 58.4 56.7
Based on the data provided, plot a graph of the surface tension versus the concentration of heptanoic acid. Using the resulting dependence, find the adsorption of heptanoic acid at the acid concentrations specified in the table. Plot an adsorption isotherm and determine the size of the surfactant molecules.

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