7. Calculate the excess adsorption of 1,2-propanediol and construct an adsorption isotherm from the dependence σ=f(c) of its aqueous solutions at T=303K.

N 10
0 0.043 0.122 0.170 0.203 0.297 0.398 0.497 0.619 0.934 1.222 1.924
σ 103, N/m 71.15 68.43 65.00 63.32 61.92 59.41 57.75 55.88 53.92 50.56 48.13 44.46

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