ISSN:
0538-8066
Keywords:
Chemistry
;
Physical Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The equilibrium constant for the reaction has been determined between 331 and 480°K using a variable-temperature flowing afterglow. These data give ΔH°(1) = -1.03 ± 0.21 kcal/mol and ΔS°(1) = - 4.6 ± 1.0 cal/mol°K. When combined with the known thermochemical values for HBr, Br-, and HNO3, this yields ΔHf298°(NO3-) = -74.81 ± 0.54 kcal/mol and S298°(NO3-) = 59.4 cal/mol·°K. In addition ΔHn-1,n and ΔSn-1,nfor the gas-phase reactions \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm NO}_3^- \cdot ({\rm HNO}_3)_{n - 1} + {\rm HNO}_3 \to {\rm NO}_3^- \cdot ({\rm HNO}_3)_n $$\end{document} were determined for n = 2 and 3. The implications of these measurements to gas-phase negative ion chemistry are discussed.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/kin.550090104
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