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The Langmuir adsorption isotherm is deduced using the assumption:

1. the adsorption sites are equivalent in their ability to adsorb the particles
2. the heat of adsorption varies with coverage
3. the adsorbed molecules interact with each other
4. the adsorption takes place in multilayers

Correct answer: the adsorption sites are equivalent in their ability to adsorb the particles

Solution

The Langmuir adsorption isotherm assumes that all adsorption sites are identical and have the same ability to adsorb particles, with no interaction between adsorbed molecules.

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