Chapter 6, Problem 6I.1ST

Interpretation Introduction

Interpretation:

The fractional coverages and the value of $\frac{\text{Δθ}}{\text{ΔP}}$ have to be calculated when the pressure increases from $\text{13}\text{.3kPa}$ to $\text{40}\text{.0kPa}$.

Concept Introduction:

Chemisorption:

In chemisorption the molecules adsorb to the surface by forming a chemical bond and tend to find the sites that maximize their co-ordination number with the substrate.  The extent of surface coverage is normally expressed as the fractional coverage $\text{θ}$.  It is the ratio of number of adsorption sites occupied to the number of available adsorption sites.

The fractional coverage can be inferred from the volume of an adsorbate adsorbed by $\text{θ}\text{=}\frac{\text{V}}{{\text{V}}_{\infty }}$, where ${\text{V}}_{\infty }$ is the volume of the adsorbate corresponding to complete monolayer