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Heats of sorption of hydrogen, carbon monoxide, nitrogen and oxygen on evaporated iron films have been determined calorimetrically ; in addition, the heats of sorption of some of these gases on films partially covered with another gas have been obtained. It is found that the sorptive ratio of carbon monoxide to hydrogen at 0.1 mm pressure is 1-60, and not 2 as previously suggested. Boudart's induced heterogeneity theory to account for the decrease of heat of sorption with coverage is shown to be invalid. Some possible applications to catalytic problems are briefly discussed.

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