At the limiting area, the spherical core radius is nm. Its aggregation number is
(1)
Above the critical micelle concentration, free monomers remain approximately at 8 mM, so 42 mM of surfactant units are in aggregates. Thus
(2)
The concentration is of whole aggregates, not the concentration of surfactant molecules inside them. The estimate neglects micelle polydispersity and concentration-dependent growth.

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