ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The enthalpy of the reaction Ba(g)+2C(graph.)=BaC2(g) has been determined by Knudsen effusion mass spectrometry over a barium alloy with noble metals contained in a graphite cell. The value ΔH(open circle)0 =252.5± 11.5kJ mol−1 has been obtained from second- and third-law evaluations of the equilibrium vapor in the temperature range 1778–2286 K. This reaction enthalpy has been combined with ancillary literature data to derive the following thermodynamic properties in kJ mol−1 of gaseous BaC2: the atomization energy, ΔatH(open circle)0 , 1180.9±12.2; the standard heat of formation, ΔfH(open circle)298 , 437.1±14.2; the enthalpy of sublimation of BaC2(s), ΔsubH(open circle)298 , 511.2±17.1; and the bond dissociation energy, D(open circle)0 (Ba–C2), 581.7±14.8. The results are discussed with regard to their possible significance in reactor technology.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.449438
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