5. Calculate the excess adsorption of nonanol and construct an adsorption isotherm from the dependence σ=f(c) of its aqueous solutions at T=293K.

s, mol/m3 0 0.0100 0.0158 0.0631 0.0794 0.1000 0.0251 0.0398 0.0500
σ 103, N/m 72.75 71.40 70.40 68.40 66.00 64.70 63.50 62.30 61.10

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