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-6- ~~I. Sulphur Vapour Sulphur vapourizes already at 100°C to an,appreciable amount, and its vapour pressure reaches at 44l+.6°C ope a.tmosphere. This makes the l00°C to l000°C region the most interesting temperature region forexperimental research. Like the ·:other phases, the vapqur has a complex composition. Only the last six years brought a clearer understanding (22) and work is still underway to determine detailed properties. Original vapour pressure measurements indicated a molecular weight of about 6 (7). Later studies at higher temperature indicated that s was a predominant component, and 2 still later it was recognized that the sulphur vapour constitutes a dissociating system (23). Detailed pressure measurements indicated that besides s8, s6 and s2 at least one other component had to be present. The resulting assumption was that s2, s4, s6 and s8 w7re the only important vapour constituents. The unfortunate .belief still persists widely and ~obably will continue to appear in new textbooks for many years to come. The results of mass spectroscopy during the last six years, clearly demonstrated that sulphur vapour also can contain s , s , s , s , s and · .... 10 also atoms. The careful and ingeneous studies leading to the conclusive identification of vapour components with odd numbers of atoms also lead to the deduction of more reliable thermod~'namic data. Table V shows the heat of formation and the entropy of formation for the major vapour con- stituents. The energy per bond in a molecule (assu..Tlled to be ring shaped) increases from s2 (51. 5 kca~-/mole) to s3 (55· 5)' s4 (57. 5)' s5 (60. 5)' and levels off at s6 (61.5), s7 (62), s8 (62.5),'s9 (... 62),. and s10 (...62.5). The rings with six and more atoms have all about the same bond energy and 9753 \ '. ••.•• ··'I t .. •'•.- .-~ . ·~ ' • ·'"·" ·. c ;,' . : ·,.,,).PDF Image | ELEMENTAL SULPHUR
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