Evaluated Thermodynamic Properties for Inorganic and Small Organic Substances

Recommended values for chemical thermodynamic properties of inorganic and C1-C2 organic substances, compiled by the National Bureau of Standards. The dataset provides enthalpy of formation, Gibbs energy of formation, entropy, and heat capacity at 298.15 K, with values for gaseous, liquid, crystalline, and aqueous states. It represents a collective edition of the serially issued 'Selected Values of Chemical Thermodynamic Properties' from 1965 to 1981.

Use Cases

• Calculate reaction enthalpies using provided enthalpy of formation values for inorganic compounds.
• Model chemical equilibrium in aqueous systems using Gibbs energy of formation data.
• Estimate heat capacities for process engineering simulations with the provided heat capacity values at 298.15 K.
• Validate computational chemistry models against the evaluated entropy values for standard-state substances.

Strengths

• Data is evaluated and recommended by the National Bureau of Standards, a recognized standards body.
• Covers multiple states of matter including gaseous, liquid, crystalline, and aqueous solutions.
• Compiles data from a long-running series of technical notes issued from 1965 to 1981.

Limitations

• Limited to inorganic substances and organic substances with only one or two carbon atoms.
• Excludes compounds of transuranium elements, alloys, solid solutions, fused salts, and substances of undefined composition.
• Primary data collection period ended in 1981, though the compilation was updated in 2022.

Provenance

Source

National Institute of Standards and Technology (NIST), originally the National Bureau of Standards.

Collection Method

Compilation and evaluation of published thermodynamic data into a collective edition.

Time Range

Data compilation spans the publication period of the original technical notes from 1965 to 1981.

Freshness

Last updated on 2022-07-29, though the underlying evaluated data is from earlier technical notes.