146. Solving a chemistry problem

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10. Using the graphical method, find the surface activity of oleic acid at the boundary of the aqueous solution with air (at T = 293 K) according to the following experimental data:

C, kmol / m 3 0,0 0,021 0,05 0,104 0,246
σ · 10 3, N / m 72.53 68.12 63.53 58.60 50.30

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