Unique thermodynamic relationships for ΔfHo and ΔfGo for crystalline inorganic salts. I, Predicting the possible existence and synthesis of Na2SO2 and Na2SeO2

The concept that equates oxidation and pressure has been successfully utilized in explaining the structural changes observed in the M2S subnets of M2SOx (x = 3, 4) compounds (M = Na, K) when compared with the structures (room- and high-pressure phases) of their parent M2S 'alloy' [Martinez-Cruz et al. (1994), J. Solid State Chem. 110, 397-398; Vegas (2000), Crystallogr. Rev. 7, 189-286; Vegas et al. (2002), Solid State Sci. 4, 1077-1081]. These structural changes suggest that if M2SO2 would exist, its cation array might well have an anti-CaF2 structure. On the other hand, in an analysis of the existing thermodynamic data for M2S, M2SO3 and M2SO4 we have identified, and report, a series of unique linear relationships between the known Delta H-f(o) and Delta(f)G(o) values of the alkali metal (M) sulfide (x = 0) and their oxyanion salts M2SOx (x = 3 and 4), and the similarly between M2S2 disulfide (x = 0) and disulfur oxyanion salts M2S2Ox (x = 3, 4, 5, 6 and 7) and the number of O atoms in their anions x. These linear relationships appear to be unique to sulfur compounds and their inherent simplicity permits us to interpolate thermochemical data (Delta H-f(o)) for as yet unprepared compounds, M2SO (x = 1) and M2SO2 (x = 2). The excellent linearity indicates the reliability of the interpolated data. Making use of the volume-based thermodynamics, VBT [Jenkins et al. (1999), Inorg. Chem. 38, 3609-3620], the values of the absolute entropies were estimated and from them, the standard Delta S-f(o) values, and then the Delta(f)G(o) values of the salts. A tentative proposal is made for the synthesis of Na2SO2 which involves bubbling SO2 through a solution of sodium in liquid ammonia. For this attractive thermodynamic route, we estimate Delta G(o) to be approximately -500 kJ mol(-1). However, examination of the stability of Na2SO2 raises doubts and Na2SeO2 emerges as a more attractive target material. Its synthesis is likely to be easier and it is stable to disproportionation into Na2S and Na2SeO4. Like Na2SO2, this compound is predicted to have an anti-CaF2 Na2Se subnet

UNLV\u27s 3rd. Annual Varsity-Alumni Game

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UNLV Rebels vs California State, Fullerton Titans

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Holiday Classic 1967 Nevada Southern Rebels Arizona State University University of Pacific Loyola University

Dear NSU Sports Fan: Welcome to another, and we hope for all of us a successful, Nevada Southern University Intercollegiate Athletics sporting event. We sincerely hope you enjoy this major sports activity, as your attendance has indicated your continued enjoyment of games in past seasons. You are watching the NSU Rebels, one of the best teams in the country - a team ranked in the Top 10 in the nation in their division last year. We of the University are justly proud of our fine athletics, and the excellent job of coaching and program directing being done by Coach Rolland Todd and Athletic Director Michael Drakulich. We feel certain your support of all our teams, present and future, will by their showing of skill and sportsmanship in this game, be justified. We thank all our loyal fans for their support. A special Thank You must go to members of the Century Club, a part of the University Rebel Club, for their unequalled contributions to the NSU Athletic Program. Again, welcome - and thank you for coming. DR. DONALD C. MOYER Chancellor A Rebel Booste

UNLV Rebels vs. MEIJI

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UNLV Rebels vs University of California, Riverside Highlanders

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13th Annual Las Vegas Holiday Classic

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UNLV Top Tier Focus - Student Achievement

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UNLV Rebels vs. Texas Tech University

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