Abstract
The equilibrium SeO(g)+ SeS(g)⇌ Se2(g)+ SO(g) has been studied by the mass-spectrometric Knudsen-cell method in the temperature interval 1300–1800 K. It leads to the thermochemical value D°0(SeO)= 426.4 ± 6.3 kJ mol–1 for the dissociation energy of the molecule SeO(g). By comparison with spectroscopic data, D°0(SeO)= 424.7+0.6–6.0 kJ mol–1 is retained as best present estimate of the dissociation energy. The corresponding enthalpy of formation from the elements in their standard reference states is ΔH°(formation, SeO, g, 298 K)= 58.9+0.8–6.0 kJ mol–1.
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