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The heats of formation of NO3− and NO3− association complexes with HNO3 and HBr

✍ Scribed by J. A. Davidson; F. C. Fehsenfeld; Carleton J. Howard

Publisher: John Wiley and Sons
Year: 1977
Tongue: English
Weight: 549 KB
Volume: 9
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550090104

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✦ Synopsis

The equilibrium constant for the reaction kl (1) NOS-+ HBr 2 Br-+ HNO, has been determined between 331 and 480'K using a variable-temperature flowing afterglow. These data give AH"(1) = -1.03 f 0.21 kcal/mol and AS"(1) = -4.6 f 1.0 cal/mol.'K. When combined with the known thermochemical values for HBr, Br-, and HNO,, this yields AH&,(NO,-) = -74.81 f 0.54 kcal/mol and S&(NO,-) = 59.4 cal/mol-'K. In addition AH,-1., and AS,-1,, for the gas-phase reactions NOS-. (HN03)n-i + HNO, --+ NOS-. (HNOa), were determined for n = 2 and 3. negative ion chemistry are discussed.

The implications of these measurements to gas-phase

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