STAND 4 TEtH NATL INST. OF EFERENCE »"" "-r^JL -SOWS « J # W ^ 4t> * 11. % 00 NBS TECHNICAL NOTE 270"8 ^ <Vau of U.S. DEPARTMENT OF COMMERCE/National Bureau of Standards Selected Values of Chemical Thermodynamic Properties Compounds of Uranium, Protactinium, Thorium, Actinium, and the Alkali Metals -QC- lOu No. 270-8 1931 NATIONAL BUREAU OF STANDARDS The National Bureau of Standards' was established by an act ot Congress on March 3, 1901. The Bureau's overall goal is to strengthen and advance the Nation's science and technology and facilitate their effective application for public benefit. To this end, the Bureau conducts research provides: ( ) and I a basis for the Nation's physical measurement system, (2) scientilic and technological services for industry and government, (3) a technical basis tor equity in trade, and (4) technical services to promote public safety. The Bureau's technical work is per- formed by the National Measurement Laboratory, the National Engineering Laboratory, and the Institute for Computer Sciences and Technology. THE NATIONAL MEASUREMENT LABORATORY provides the national system ol physical and chemical and materials measurement; coordinates the system with measurement systems of other nations and furnishes essential services leading to accurate and uniform physical and chemical measurement throughout the Nation's scientilic community, industry, and commerce; conducts materials research leading to improved methods ol measurement, standards, and data on the properties of materials needed by industry, commerce, educational institutions, and Government; provides advisory and research services to other Government agencies; develops, produces, and distributes Standard Relerence Materials; and provides calibration services. The Laboratory consists ol the lollowmg centers: Absolute Physical Quantities — Radiation Research — Thermodynamics and Molecular Science — Analytical Chemistry — Materials Science. THE NATIONAL ENGINEERING LABORATORY provides technology and technical ser- vices to the public and private sectors to address national needs and to solve national problems: conducts research in engineering and applied science in support ol these ellorts; builds and maintains competence in the necessary disciplines required to carry out this research and technical service; develops engineering data and measurement capabilities; provides engineering measurement traceability services; develops lest methods and proposes engineering standards and code changes: develops and proposes new engineering practices; and develops and improves mechanisms to transfer results ol its research to the ultimate user. The Laboratory consists of the following centers: Applied Mathematics — Electronics and Electrical Engineering* — Mechanical Engineering and Process Technology- — Building Technology — Fire Research — Consumer Product Technology — Field Methods. THE INSTITUTE FOR COMPUTER SCIENCES AND TECHNOLOGY conducts research and provides scientific and technical services to aid Federal agencies in the selection, acquisition, application, and use of computer technology to improve effectiveness and economy in Government operations in accordance with Public Law 89-306 (40 U.S.C. 759), relevant Executive Orders, and other directives; carries out this mission by managing the Federal Information Processing Standards Program, developing Federal ADP standards guidelines, and managing Federal participation in ADP voluntary standardization activities; provides scientific and technological advisory services and assistance to Federal agencies; and provides the technical foundation for computer-related policies of the Federal Government. The Institute consists of the following centers: Programming Science and Technology — Computer Systems Engineering. 'Headquarters and Laboratories at Gaithersburg, MD, unless otherwise noted; mailing address Washington, DC 20234. : Some divisions within the center are located at Boulder, CO 80303. Of »TAHMP»* DEC ;i0 1982 Selected Values of Chemical Thermodynamic Properties Compounds of Uranium, Protactinium, Thorium, Actinium, and the Alkali Metals *V> /y/ £ 5 -Kc Wi l.oJL Ac »»» D. D. Wagman, W. H. Evans, V. B. Parker, R. H. Schumm, and R. L. Nuttall Center for Thermodynamics and Molecular Science National Measurement Laboratory National Bureau of Standards Washington, DC 20234 U.S. DEPARTMENT OF COMMERCE, Malcolm Baldrige, Secretary NATIONAL BUREAU OF STANDARDS, Ernest Ambler, Director Issued May 1981 National Bureau of Standards Technical Note 270-8 Nat.Bur.Stand.(U.S.), Tech. Note 270-8, 149 pages (May 1981) CODEN: NBTNAE U.S. GOVERNMENT PRINTING OFFICE WASHINGTON: 1981 For sale by the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402 Price $5.50 (Add 25 percent for other than U.S. mailing) PREFACE This is the eighth Technical Note in a series of publications containing selected values of chemical thermodynamic properties of inorganic compounds. This Technical Note essentially completes the revision of National Bureau of Standards Circular 500, Selected Values of Chemical Thermodynamic Properties, by F. D. Rossini, D. D. Wagman, W. H. Evans, S. Levine, and I. Jaffe. This volume covers the compounds of the elements uranium, protactinium, thorium, actinium, lithium, sodium, potassium, rubidium, cesium, and francium. In ad- dition there is an appendix in which are listed revisions to a number of the values given in the preceding Technical Notes in this series (NBS Technical Notes 270-3 through 270-7). These revisions include data for some additional compounds as well as updates and corrections for errors that have been brought to our attention. The values for the compounds of thorium, sodium, potassium, and rubidium given in this Technical Note supersede those given in the earlier reports, NBSIR 76-1034, Chemical Thermodynamic Properties of Compounds of Sodium, Potas- sium, and Rubidium: An Interim Tabulation of Selected Values, and NBSIR 77-1300, A Computer-Assisted Evaluation of the Thermochemical Data of the Compounds of Thorium. The latter report utilizes auxiliary data different from that used in this series of Technical Notes. A combined volume containing all the material published in the Technical Note 270 series is being prepared for publication. This volume will be in SI units. The continued encouragement and assistance of the Office of Standard Ref- erence Data of the National Bureau of Standards is gratefully acknowledged. in . ABSTRACT This publication contains tables of recommended values for the standard enthalpies (heats) of formation, Gibbs (free) energies of formation, entropies, enthalpy contents and heat capacities at 298.15 K and enthalpies of formation at K for compounds of uranium, protactinium, thorium, actinium, lithium, sodium, potassium, rubidium, cesium, and f ranci urn Key Words: Enthalpy; entropy; Gibbs energy of formation; heat capacity; uranium compounds; protactinium compounds; thorium compounds; actinium compounds; lithium compounds; sodium compounds; potassium compounds; rubidium compounds; cesium compounds; franc i u m compounds. IV CONTENTS Preface iii Abstract iv Introduction vii Standard Order of Arrangement of the Elements . xiv Conversion Factors for Units of Energy xv Table 88 Uranium 1 Table 89 Protactinium 7 Table 90 Thorium 8 Table 91 Actinium 12 Table 98 Lithium 13 Table 99 Sodium 23 Table 100 Potassium 54 Table 101 Rubidium 84 Table 102 Cesium 95 TabLe 103 Francium 108 Appendix 109 Index of Contents 135 . SELECTED VALUES OF CHEMICAL THERMODYNAMIC PROPERTIES by Donald D. W a g m a n , WiLLiam H. Evans, Vivian B. Parker, Richard H. Schumm, and RaLph L. Nuttall INTRODUCTION Substances and Properties Included in the Tables The tables contain values where known of the enthalpy and Gibb s energy of formation, enthalpy, entropy and heat capacity at 298.15 K (25 C), and the enthalpy of formation at K, for all inorganic substances and organic molecules containing not more than two carbon atoms. In some instances such as for metal-organic compounds, data are given for substances in which each organic radical contains one or two carbon atoms. No values are given in these tables for metal alloys or other solid solutions, fused salts, or for substances of undefined chemical composi ti on Physical States The physical state of each substance is indicated in the column headed "State" as crystalline solid (c), liquid [L), glassy or amorphous (amorp), or gaseous (g). For solutions, the physical state is that normal for the indicated solvent at 298.15 K. Isomeric substances or various crystalline modifications of a given substance are designated by a number following the letter design- ation, as c2, g2, etc. Definition of Symbols The symbols used in these tables are defined as follows: P = pressure; V = voLume; T = absolute temperature; S = entropy; H = enthalpy (heat content); G = H - TS = Gibbs energy (formerly the free energy); C = (dH/dT) = heat capacity at constant " " pressure. vn e Conventions Regarding Pure Substances The values of the thermodynamic properties of the pure substances given in these tables are for the substances in their standard states o (indicated by the superscript on the thermodynamic symbol). These standard states are defined as follows: For a pure solid or liquid, the standard state is the substance in the condensed phase under a pressure of one atmosphere.* For a gas the standard state is the hypothetical ideal gas at unit fugacity, in which state the enthalpy is that of the real gas at the same temperature