74. Solving a chemistry problem

2. According to the results of measurements of the surface tension of solutions of n-butyl alcohol in water at 12.0°C depending on the concentration (table below, concentration C in mmol/l, surface tension σ in mN/m), find the limiting adsorption of alcohol Г∞ using a graphical method, and calculate the area occupied by 1 alcohol molecule in the saturated adsorption layer in the monomolecular adsorption sentence.

C 0 3.2 4.8 6.4 8.5 13.0 16.9 26.0 33.8 51.0 67.5 102 135 203
σ 74.2 73.0 73.1 72.0 71.3 71.3 70.1 68.0 65.8 63.1 60.7 56.9 53.8 48.9