Atkins' Physical Chemistry
Atkins' Physical Chemistry
11th Edition
ISBN: 9780198769866
Author: ATKINS, P. W. (peter William), De Paula, Julio, Keeler, JAMES
Publisher: Oxford University Press
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Chapter 19, Problem 19B.11P
Interpretation Introduction

Interpretation:

For the given data, the isotherm that best fits has to be chosen.

Concept Introduction:

Langmuir isotherm:

The Langmuir isotherm, which relates the surface coverage to the pressure, and in which the parameter alpha has the dimensions of 1/pressure:

    θ=KP1+KP 

Freundlich isotherm:

  θ=C1P1/c2

This isotherm attempts to incorporate the role of interactions between the adsorbed

molecules on the surface.

Temkin isotherm:

    θ= c1 ln(c2, p)

where c1, and c2 are constants, corresponds to supposing that the adsorption enthalpy changes linearly with pressure.

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