3. The value of the limiting adsorption of p-toluidine at the solution-air interface is 6.54 * 10-6 mol/m2, and at the water-benzene interface - 6.44 * 10-6 mol/m2. Determine the cross-sectional area of the surfactant molecule. Does the nature of the phase boundary affect the location of surfactant molecules in the surface layer?

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