Abstract
1. Measurements have been made of the adsorption isotherms and differential heat of adsorption of neopentane and carbon tetrachloride on thermal black graphitized at 3000°. 2. The large sphere-like molecules of these substances are adsorbed in a predominantly nonlocalized way, and interact strongly with one another, which causes a marked increase in the heat of adsorption as the monolayer is being filled and a strongly concave initial portion of the adsorption isotherm. 3. Free rotations or rotational oscillations of these molecules are possible in the adsorbed layer with small amounts of surface filling. 4. A discussion is given of different possible ways of defining the standard state of the adsorbed layer on a homogeneous surface, and values are given for the corresponding thermodynamic quantities of the adsorptive systems studied.
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