STANDARD ENTHALPIES OF FORMATION OF 3-METHYLPENTANE-2,4-DIONE AND OF BIS(3-METHYLPENTANE-2,4-DIONATO)COPPER(II) - THE MEAN (CU-O) BOND-DISSOCIATION ENTHALPY

• Type: Article in International Scientific Journal
• Date: 1992

Authors

DASILVA, MAVR (Author) FCUP; FERRAO, MLCCH (Author) Other; MONTE, MJS (Author) FCUP; DASILVA, RMGE (Author) Other; RIBEIRO, JC (Author) Other

Journal

Title: Journal of Chemical Thermodynamics

Vol. 24

Pages: 585-594

ISSN: 0021-9614

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 10 Citations

Scopus - 11 Citations

Scientific classification

FOS: Engineering and technology > Mechanical engineering

Other information

Authenticus ID: P-001-PHB

Abstract (EN): The standard (po = 0.1 MPa) molar enthalpy of combustion in oxygen at 298.15 K of liquid 3-methylpentane-2,4-dione (HMeacac) was measured by static bomb calorimetry as -(3353.2±1.7) kJ · mol-1. The standard molar enthalpy of formation of the crystalline copper(II) complex with 3-methylpentane-2,4-dione was determined, at the temperature 298.15 K, by solution-reaction calorimetry. The vapour pressures of the complex were measured as function of temperature by the Knudsen-effusion technique, and the standard molar enthalpy of sublimation ¿g crHo m(396.70 K)/(kJ · mol-1) = 130.7 ± 1.0, was derived by the Clausius-Clapeyron equation. From this value, the standard molar enthalpy of sublimation was calculated as ¿g crHo m(298.15 K)/(kJ · mol-1) = 135.6 ± 1.0. Measurement of the standard molar enthalpy of sublimation using a direct microcalorimetric method, confirmed the value from the Knudsen technique.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10