THE THERMODYNAMIC PROPERTIES OF MOLTEN SALTS. Report No. 4. Bimonthly Progress Report for August-September 1955

Technical Report · Mon Oct 10 00:00:00 EDT 1955

DOI:https://doi.org/10.2172/4378490· OSTI ID:4378490

Brady, A P

The objective of this research is to determine the absolute entropies, heats of formation, and free energies of formation of selected salts in the temperature range of 800 to 1900 deg F. Assembling and testing of apparatus for measuring heat capacities from about 50 deg K to room temperature has been completed, including calibration of thermocouples by comparison with a platinum and with a copper resistance thermometer. This apparatus has been used to determine the absolute entropy of molybdenum hexafluoride vapor at 298.16 deg K. The result, 79.7 +- 0.6 calories/mole deg C, agrees well with that calculated from its spectrum, 80.05 cal/mole deg C. A solution calorimeter has also been assembled and tested. By comparing the heat of solution in aqueous sodium hydroxide of molybdenum hexafluoride with that of the oxide, the delta H of formation of the fluoride was found to be -392.2 cal/mole at 298.16 deg K. These data, together with other data extant in the literature, allow calculation of the desired thermodynamic functions over the temperature range of interest.

• Research Organization: Stanford Research Inst., Menlo Park, CA (US)
• Sponsoring Organization: USDOE; Wright Air Development Center, Air Research and Development Command, US Air Force, OH (US)
• DOE Contract Number: AF 33(616)-2558
• NSA Number: NSA-10-000635
• OSTI ID: 4378490
• Report Number(s): NP-5809
• Resource Relation: Other Information: SRI Project No. CU-1102. Orig. Receipt Date: 31-DEC-56
• Country of Publication: United States
• Language: English

Related Subjects

CHEMISTRY
BEHAVIOR
CALORIMETERS
COPPER
ELECTRIC CONDUCTIVITY
ENTHALPY
ENTROPY
FUSED SALTS
HIGH TEMPERATURE
LABORATORY EQUIPMENT
LOW TEMPERATURE
MATHEMATICS
MEASURED VALUES
MELTING
MOLYBDENUM FLUORIDES
MOLYBDENUM OXIDES
PLATINUM
SALTS
SODIUM HYDROXIDES
SOLUTIONS
SPECIFIC HEAT
TEMPERATURE
TESTING
THERMOCOUPLES
THERMODYNAMICS
VAPORS
WATER