Manganese carbonyl: heat of formation by rotating-bomb calorimetry

Journal Article · Tue Jul 01 04:00:00 EDT 1958 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j150565a021· OSTI ID:7098514

Good, W D; Fairbrother, D M; Waddington, G

The heat of formation of dimanganese decacarbonyl (Mn/sub 2/(CO)/sub 10/) was determined by combustion calorimetry. A rotating-bomb method was employed, and a solution of nitric acid and hydrogen peroxide was used in the bomb to convert all manganese-containing products of combustion to Mn/sup + +/ ion. The combustion reaction was referred by suitable comparison experiments to an aqueous solution of composition Mn(NO/sub 3/)/sub 2/ . 10.309H/sub 2/O as a product. This procedure also minimized errors in reduction of the data to standard states. The results of the calorimetric experiments gave for the reaction Mn/sub 2/(CO)/sub 10/(c) + 4HNO/sub 2/ (in 16H/sub 2/O) + 6O/sub 2/(g) = 2Mn(NO/sub 3/)/sub 3/ (in 10.309H/sub 2/O) + 10CO/sub 2/(g) + 2H/sub 2/O(liq) the value ..delta..H/sup 0//sub 296.16/ = -777.0 +- 0.8 kcal. The derived value for the heat of formation of solid manganese carbonyl from graphite, oxygen gas and manganese metal, ..delta..Hf/sup 0//sub 296.16/, is -400.9 kcal. mole/sup -1/.

• Research Organization: Bureau of Mines, Bartlesville, OK
• OSTI ID: 7098514
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 62:7; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
AQUEOUS SOLUTIONS
CALORIMETRY
CARBONYLS
DISPERSIONS
ENTHALPY
FORMATION HEAT
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
INORGANIC ACIDS
MANGANESE COMPOUNDS
MIXTURES
NITRIC ACID
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
OXYGEN COMPOUNDS
PEROXIDES
PHYSICAL PROPERTIES
REACTION HEAT
SOLUTIONS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS