Convert the number of molecules to concentration in \(\frac{\text{mmol}}{\text{l}}\).
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
Number of molecules
Surface in \(\text{nm}^3\)
Concentration in \(\frac{\text{mmol}}{\text{l}}\)