The inferred saturation density is physically implausible for a single molecular layer in the printed units:
That is far smaller than an atomic cross-section, let alone a butyric-acid molecule. The near-linear reciprocal plot therefore does not validate the physical monolayer interpretation. Possible issues include reported units or normalization, inaccessible/internal area not accounted for correctly, multilayer adsorption or other uptake processes. The numbers must not silently be relabelled as micromoles to obtain a more comfortable molecular area.

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