Accession Number : ADA332920

Title :   Critical Review of the Heats of Formation of HNO and Some Related Species

Descriptive Note : Final rept. for 1992-1997

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Anderson, William R.

PDF Url : ADA332920

Report Date : NOV 1997

Pagination or Media Count : 50

Abstract : A critical review of the heat of formation of HNO is presented. This molecule and, therefore, its thermodynamics parameters play crucial roles in the chemical mechanism of propellant combustion and NOx pollutant chemistry. It was found that predissociation experiments, which have gone largely unnoticed for over 15 yr, lead to a significant revision in the recommended value. The new value, 25.6 + 0.6 kcal/mol and 25.6 - 0.1 kcal/mol (298 K; 26.3 kcal/mol at 0 K), is 1 to 2 kcal/mol higher than previous recommendations and has much narrower error limits. Heats of formation of NO, NH2OH, (HNO)(+), and (HNO)(-) are also briefly examined, and recommendations are made. Finally, recommendations for future experiments and a brief survey of methods of production of HNO are given in the hope that these will facilitate future studies.

Descriptors :   *NITRIC ACID, *NITROUS OXIDE, *NITRATES, *HEAT OF FORMATION, THERMODYNAMICS, COMBUSTION, POLLUTANTS, GUN PROPELLANTS, HYDRAZOIC ACID.

Subject Categories : Ammunition and Explosives
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE