8. Calculate the excess adsorption of 1,3-propanediol and construct an adsorption isotherm from the dependence σ=f(c) of its aqueous solutions at T=303K.

N 10 0 0.070 0.088 0.154 0.250 0.326 0.435 0.651 0.743 0.929 1.091 1.259
σ 103, N/m71.15 68.18 67.38 65.23 62.72 61.74 60.25 57.75 57.10 55.60 54.97 54.11

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