The adsorption of a gas is described by the Langmuir isotherm with α = 1.85 k P k − 1 a t 25 o C . The pressure at which the fractional surface coverage is 0.10 has to be calculated. Concept introduction: Adsorption: A molecule (adsorbate) that forms a bond to the surface (adsorbent). Associative Adsorption: A gas molecule adsorbs without fragmentation. Dissociative Adsorption: A gas molecule adsorbs and fragmentation occurs. Langmuir adsorption: The isotherm is based on the characteristic assumptions that only monomolecular adsorption takes place, adsorption is localized and the heat of adsorption is independent. Langmuir equation: p / V = p / V m + a V m

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Chapter 6, Problem 6I.2E

(a)

Interpretation Introduction

Interpretation:

The adsorption of a gas is described by the Langmuir isotherm with α=1.85 k Pk−1 at 25oC. The pressure at which the fractional surface coverage is 0.10 has to be calculated.

Concept introduction:

Adsorption: A molecule (adsorbate) that forms a bond to the surface (adsorbent).

Associative Adsorption: A gas molecule adsorbs without fragmentation.

Dissociative Adsorption: A gas molecule adsorbs and fragmentation occurs.

Langmuir adsorption: The isotherm is based on the characteristic assumptions that only monomolecular adsorption takes place, adsorption is localized and the heat of adsorption is independent.

Langmuir equation: p/V= p/Vm+ aVm

(b)

Interpretation Introduction

Interpretation:

The adsorption of a gas is described by the Langmuir isotherm with α=1.85 k Pk−1 at 25oC. The pressure at which the fractional surface coverage is 0.90 has to be calculated.

Concept introduction:

Adsorption: A molecule (adsorbate) that forms a bond to the surface (adsorbent).

Associative Adsorption: A gas molecule adsorbs without fragmentation.

Dissociative Adsorption: A gas molecule adsorbs and fragmentation occurs.

Langmuir adsorption: The isotherm is based on the characteristic assumptions that only monomolecular adsorption takes place, adsorption is localized and the heat of adsorption is independent.

Langmuir equation: p/V= p/Vm+ aVm

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