Past exam of the chemistry A course of the University of Cambridge / 2023 / Paper 2 / A6 / d / ii

Dividing the total adsorbed population by the number of underlying adsorption sites givesThis multilayer uptake can exceed one because it is a mean column height. The occupied-site fraction remains $1-{\theta }_0=bp<1$. If each layer has the same binding energy and microscopic states assumed in the single-layer calculation, the corresponding thermodynamic expression for $b$ is also the one obtained there; the kinetic ratio is the definition supplied by this multilayer model.