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It has been confirmed that the temperature and concentration dependence of an absorption band in iodine vapor (around 265 mp) can be explained by assuming the existence of the equilibrium 21, = 14, with both Iz and 1 4 contributing to the absorbance. Equilibrium constants over the range 150-420' and the entropy (123 & 2 eu at 605°K) and enthalpy of formation (AH'6os = -2.9 f 0.4 kcal mol-l) of L(g) have been deduced from spectrophotometric data. The thermodynamic results are in accord with those expected for a complex formed by the van der Waals interaction in which the two 1 2 partners move relatively freely with respect to each other. The absorption appears to be associated with a charge-transfer transition.

The stoichiometry of this reaction is well established and forms a basis for the quantitative determination of hydrogen peroxide (2).The present investigation was undertaken to determine the experimental heat of reaction. EXPERIMENTAL Calorimeter. The calorimeter consists of a 660-ml. vacuum flask and a wood cover with cork gaskets. Passing through

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