Bourdon gauge measurements of samples of I 2 (g) plus (s) have been made in the temperature range 900°–1200°K and over a fourfold range in pressure. The pressure vs . temperature behavior of the system can be described satisfactorily by the equilibria, The standard enthalpy and entropy of the first reaction between 900°–1200 °K were calculated using the second law with the result; , . The standard heat of formation, and entropy, were found to be 44.2 kcal and 15.4 e.u., respectively.
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Sedgwick et al. (1966) studied this question.