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

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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 ... continued below

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Pages: 7

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Brady, A.P. October 10, 1955.

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Description

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.

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Pages: 7

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  • Other Information: SRI Project No. CU-1102. Orig. Receipt Date: 31-DEC-56

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  • Report No.: NP-5809
  • Grant Number: AF 33(616)-2558
  • DOI: 10.2172/4378490 | External Link
  • Office of Scientific & Technical Information Report Number: 4378490
  • Archival Resource Key: ark:/67531/metadc1021273

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  • October 10, 1955

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  • Oct. 15, 2017, 10:09 p.m.

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  • Oct. 26, 2017, 2:03 p.m.

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Brady, A.P. THE THERMODYNAMIC PROPERTIES OF MOLTEN SALTS. Report No. 4. Bimonthly Progress Report for August-September 1955, report, October 10, 1955; United States. (digital.library.unt.edu/ark:/67531/metadc1021273/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.