5. Determine the surface activity of C4H8O2 acetic ethyl ester and the length of its molecule according to the following experimental data:
С, mmol/l 0 7.8 15.6 31.2 62.5 250
b, mJ/m2 71.96 69.6 68 65.1 61.5 49.7. The density of the ether is 0.9005 g/cm3.

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