3. Calculate the adsorption and surface activity of butyric acid at the aqueous solution-air interface at 293 K C0 = 0.104 Kmol/m3 according to the data:
C, Kmol/m3 0.006 0.021 0.050 0.104 0.246
b•103, N/m 72.53 68.12 63.53 58.60 50.30

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