THERMOCHEMISTRY OF OXYGEN-FLUORINE BONDING
Final technical summary rept. 1 Mar 1961-28 Feb 1963
UNITED TECHNOLOGY CENTER SUNNYVALE CA
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The heat of formation of fluorine nitrate, NO3F, was determined to be 2.5 0.6 kcalmole. The heat of formation of fluorine perchlorate, ClO4F, was determined to be 37.6 9 kcalmole from the measured value of the heat of hydroly sis. The direct synthesis reaction for nitryl fluoride, NO2F, yielded a heat of formation value of -25.8 0.5 kcalmole. Procedures which will yield thermochemical information leading to the heat of formation of the compounds fluorine fluorosulfonate FSO3F and pentafluorosulfur hypofluorite F5SOF are specified. Well-defined reactions with thermodynamically known products are available for evaluation of the thermochemi cal properties of these O-F bonded species. A narrow range of values 37 to 47 kcalmole for the O-F bond energy was obtained from the heat of formation and normal assumptions for the other bonds present in the molecule for the species for which data were obtained or avail able. The average value for the energy of the O-F bond for all O-F bonded species was found to be 43 kca which corresponds very closely to the value of 45 kcalmole derived from the heat of formation of oxygen difluoride. The variation found in the O-F bond energies for the species is less than is observed for other bonds.
- Physical Chemistry
- Combustion and Ignition
- Solid Rocket Propellants