3. When measuring the surface tension of aqueous solutions of polyethylene glycol hexadecyl ether with different degrees of oxyethylation m at 200C, the following data were obtained:

s, mmol/l σ of nonionic surfactant solution at m=55, mJ/m2
0.02 69.2
0.05 64.9
0.10 59.6
0.15 56.2
0.20 55.3
0.30 54.3
0.40 53.9
0.50 53.7
0.70 53.7
1.0 53.7

Determine the values of CMC and the area s0 occupied by one surfactant molecule in a saturated adsorption layer at the solution-air interface.

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