517. Solutions of the non-ionic surfactant NPE18 (molecular weight 1019 g/mol) were studied by osmometry at 25 degrees using a membrane permeable to the solvent (water), but not permeable to the surfactant. The solvent chamber contained a solution with a constant surfactant concentration somewhat higher than the CMC, while a surfactant with a variable concentration exceeding the concentration in the solvent chamber by delta c was placed in the solution chamber. Using the data obtained, determine the molar mass of micelles and the number of molecules in the composition of micelles (aggregation number):
Δc, g/l 5.0 9.0 14.0 19.0
π, Pa 215 402 659 934

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