Accession Number : ADD095119

Title :   Ideal Gas Thermodynamic Properties of Methanoic and Ethanoic Acids,

Corporate Author : NATIONAL STANDARD REFERENCE DATA SYSTEM

Personal Author(s) : Chao, Jing ; Zwolinski, Bruno J

Report Date : Jan 1978

Pagination or Media Count : 20

Abstract : Thermodynamic properties for methanoic (formic) and ethanoic (acetic) acid monomers and dimers in the ideal gaseous state over the temperature range from 0 to 1500 K at 1 atm have been calculated by the statistical thermodynamic method using the most recent and reliable molecular and spectroscopic constants. The internal rotational contributions of -OH and CH3 rotors to the thermodynamic properties were evaluated based on internal rotation partition functions formed by summation of calculated internal rotation energy levels. On an assumption that the vapor contains only monomers and dimers, the thermodynamic properties for the monomer-dimer equilibrium mixture of methanoic and ethanoic acids in ideal gaseous state were derived. The results are in agreement with available experimental data. (Author)

Descriptors :   *FORMIC ACID, *ACETIC ACID, *THERMODYNAMIC PROPERTIES, *IDEAL GAS LAW, MIXTURES, VAPOR PHASES, MONOMERS, DIMERS, EQUILIBRIUM(GENERAL), HEAT OF FORMATION, ENTHALPY, ENTROPY, FREE ENERGY, SPECIFIC HEAT, MOLECULAR ROTATION, MOLECULAR ENERGY LEVELS, TORSION, FREQUENCY, TEMPERATURE

Subject Categories : Organic Chemistry
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE