The enthalpy of formation of the C6 molecule from mass spectrometric equilibrium measurements
β Scribed by Karl A. Gingerich; Heidi C. Finkbeiner; Richard W. Schmude Jr.
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 372 KB
- Volume
- 207
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
β¦ Synopsis
The equilibrium between graphite and C,(g) has been investigated by Knudsen effusion mass spectrametry at temperatures between 2630 and 2810 K. Together with thermal functions calculated from experimental and theoretical molecular parameters for the linear cumulenic structure, the third law enthalpy of formation, AHr,,= I3 12 + 18 kJ mol-' and the atomization energy AJ&c=2955? 20 kJ mol-', have been obtained.
π SIMILAR VOLUMES
Partial pressures of Si(g) and Si6(g) over condensed silicon have been measured by Knudsen cell mass spectrometry. The atomization energy and enthalpy of formation of Si6(g) was evaluated for the reaction Si6(g) = 6Si(g) with these partial pressures and with thermal functions derived from recent exp
The partial pressures of Si(g) and S&(g) over condensed silicon have been determined by Knudsen effusion mass spectrometry. Thermal functions for Si, have been calculated from recent theoretical results. The values for the atomization enthalpy and the enthalpy of formation for gaseous Si, are: LIH,,
Computations at the RCCSD(T)/aug-cc-pVDZ//B3LYP/6-31G\* level of theory indicate that neutral C 6 CO is a stable species. The ground state of this neutral is the singlet cumulene oxide :C=C=C=C=C=C=C=O. The adiabatic electron affinity and dipole moment of singlet C 6 CO are 2.47 eV and 4.13 D, respe