Abstract
The standard enthalpy of combustion of selenium (grey, hexagonal, crystalline) in oxygen has been measured in a rotating-bomb combustion calorimeter, when the product of combustion was a well-defined solution of selenium dioxide. The standard enthalpy of combustion of diphenyl selenide has been found to be −(1577.3±1.0) kcal th mol −1 which yields a standard enthalpy of formation Δ H o f (C 12 H 10 Se, g)=+(69.3±2.0) kcal th mol −1 . From this the mean bond-dissociation energy, 〈D〉(Se-Ph)=(70.2±3) kcal th mol −1 has been calculated.
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