05_01_86 - CODATA KEY VALUES FOR THERMODYNAMICS The...

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CODATA KEY VALUES FOR THERMODYNAMICS The Committee on Data for Science and Technology (CODATA) has conducted a project to establish internationally agreed values for the thermodynamic properties of key chemical substances. This table presents the final results of the project. Use of these recommended, internally consistent values is encouraged in the analysis of thermodynamic measurements, data reduction, and preparation of other thermodynamic tables. The table includes the standard enthalpy of formation at 298.15 K, the entropy at 298.15 K, and the quantity H ° (298.15 K)– H ° (0). A value of 0 in the ∆ f H ° column for an element indicates the refer- ence state for that element. The standard state pressure is 100000 Pa (1 bar). See the reference for information on the dependence of gas-phase entropy on the choice of standard state pressure. Substances are listed in alphabetical order of their chemical for- mulas when written in the most common form. The table is reprinted with permission of CODATA. Reference Cox, J. D., Wagman, D. D., and Medvedev, V. A., CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1989. Substance State ° (298.15 K) kJ mol f –1 H S ° (298.15 K) J K mol –1 –1 H H ° (298.15 K) ° (0) kJ mol –1 Ag cr 0 42.55 ± 0.20 5.745 ± 0.020 Ag g 284.9 ± 0.8 172.997 ± 0.004 6.197 ± 0.001 Ag + aq 105.79 ± 0.08 73.45 ± 0.40 AgCl cr –127.01 ± 0.05 96.25 ± 0.20 12.033 ± 0.020 Al cr 0 28.30 ± 0.10 4.540 ± 0.020 Al g 330.0 ± 4.0 164.554 ± 0.004 6.919 ± 0.001 Al +3 aq –538.4 ± 1.5 –325 ± 10 AlF 3 cr –1510.4 ± 1.3 66.5 ± 0.5 11.62 ± 0.04 Al 2 O 3
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This note was uploaded on 02/04/2011 for the course CHEM 101 taught by Professor Dr.n during the Spring '10 term at McMaster University.

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05_01_86 - CODATA KEY VALUES FOR THERMODYNAMICS The...

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