The heats of immersion of temperature activated rutile have been measured in water, n-propyl alcohol and n-butyl chloride as a function of the amount of wetting liquid preadsorbed. Vapor phase adsorption isotherms were Type II for water and n-butyl chloride and Type I for n-propyl alcohol. Isosteric heats of adsorption were calculated. These data showed the futility in comparing values of the heat of immersion of a clean solid, hmu, immersed in several liquids without further data. The assumptions made too often in the past in studies where adsorption and calorimetric data were incomplete that physical adsorption predominates, orientation and monolayer capacities can be estimated, and that Aksd near monolayer coverage is equal to hh, etc., in order to estimate heats of adsorption were shown to be invalid for some and perhaps many other systems reported in the past.
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