Non-faradaic peaks produced by the two-dimensional (2D) condensation of organic molecules on an electrode were studied theoretically by using cyclic voltammetry. Under limiting conditions of low scan rate and overpotential, the classical and atomistic theories of nucleation were found to predict the same behaviour for this type of process. The model developed from the previous study was also used to predict hysteresis in capacitance-potential curves for this type of process. With slight nomenclature changes, the ensuing mathematical expressions are also applicable to 2D phase transitions involving the simultaneous exchange of electrons between deposited molecules and the electrode.