Convert the concentration in \(\frac{\text{mmol}}{\text{l}}\) to number of molecules.
The concentration in regard to volume is calculated by
with volume \(V\). Assuming that the unit of the concentration is \(\text{mmol}\cdot\text{l}\) and of the volume is \(\text{nm}^3\), the number of molecules is given by
and thus
Concentration in \(\frac{\text{mmol}}{\text{l}}\)
Surface in \(\text{nm}^3\)
Number of molecules