129. According to the results of measurements of the surface tension of solutions of n-heptyl alcohol in water at 39.0 ° C, depending on the concentration (table below), find the limiting adsorption of alcohol G∞ using a graphical method, and calculate the area occupied by 1 molecule of alcohol in a saturated adsorption layer, assuming a monomolecular adsorption.

С, mmol/l 0 0.22 0.44 0.87 1.29 1.73 2.58 3.45 5.16 6.90
b, mN/m 70.1 69.5 68.1 65.3 62.0 60.0 55.9 52.1 46.4 41.5

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