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《The Journal of chemical thermodynamics》2003,35(8):1309-1319
A micro static-bomb combustion calorimeter, developed from a 1107 Parr semi-micro bomb, has been provided with a new micro-bomb and calorimetric bucket. In the best conditions of operation, the energy equivalent of this calorimetric arrangement is just ε(calor)=(731.82 ± 0.22) J · K−1, which means an uncertainty of 0.03 per cent for the calibration with benzoic acid NIST 39j. This combustion calorimeter has been used in the measurement of the enthalpy of combustion of the succinic acid and acetanilide, giving −(1489.3 ± 1.6) kJ · mol−1 and −(4222.5 ± 1.1) kJ · mol−1, respectively, for these substances. 相似文献
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Giannoula Theodorakopoulos Imre G. Csizmadia Michael A. Robb 《Chemical physics letters》1980,69(1):66-70
Two series of investigations are reported on LL double-hole states of molecules containing sulphur. First the results on the LL double ionization potentials and K-LL Auger energies of H2S and SO2 show that the use of a frozen-orbital approximation is preferable to SCF methods for calculation of chemical shifts in K-LL Auger energies and LL ionization potentials. Secondly chemical shifts of K-LL Auger energies of a series of model molecules H2S, H2SO4, H4SO2 and H2SO2 are correlated with the formal oxidation state of sulphur. This correlation gives a shift of 12 eV in Auger energy per formal charge on sulphur. 相似文献
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《The Journal of chemical thermodynamics》2007,39(5):689-697
A new mini-bomb combustion calorimeter designed at the University of Lund was improved, installed and calibrated at the University of Porto. This calorimeter is suitable for high precision combustion calorimetry with samples of mass about (10 to 40) mg. The energy equivalent of the calorimeter, εcal = (1946.45 ± 0.11) J · K−1, was obtained from 15 independent calibration experiments with benzoic acid SRM 39i. Anthracene, succinic acid, acetanilide, and 1,2,4-triazole were used as test compounds, with excellent agreement with the literature values.
Empty Cell | ||
Empty Cell | kJ · mol−1 | kJ · mol−1 |
Anthracene | 7062.6 ± 2.1 | 124.3 ± 2.8 |
Succinic acid | 1490.2 ± 0.7 | −941.3 ± 0.9 |
Acetanilide | 4226.2 ± 1.1 | −208.2 ± 1.6 |
1,2,4-Triazole | 1326.1 ± 0.4 | 110.3 ± 0.5 |