ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Determination of Standard Molar Enthalpy of Formation for Crystalline endo-Tricyclo[5.2.1.0^2,6]decane by an Isoperibol Oxygen-Bomb Combustion Calorimeter

J.-T. Chen, Y.-Y. Di, Z.-C. Tan, H.-T. Zhang, and L.-X. Sun

College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, P. R. China

E-mail: myyydi@eyou.com

Received: 19 July 2004

Abstract: The construction and principle of the new-established isoperibol oxygen-bomb combustion calorimeter are described. The energy equivalent ( ε calor ) of the calorimeter has been determined from ten combustion experiments using about 0.7 g of NIST 39i benzoic acid with a certified mass energy of combustion, Δ c U = − (26434 ± 3) J g − 1 , under experimental conditions: ε calor = (13572 ± 2) J K − 1 . The constant-volume energy of combustion of the compound, endo-tricyclo[5.2.1.0 2 , 6 ]decane (C 10 H 16 ), has been determined to be Δ U c (C 10 H 16 , s) = − (6070 ± 3) kJ mol − 1 by means of the oxygen-bomb combustion calorimeter at T = (298.15 ± 0.001) K. The standard molar enthalpy of combustion of the sample has been calculated, Δ c H om (C 10 H 16 , s) = − (6060 ± 3) kJ mol − 1 , from the constant-volume combustion energy. From the Hess thermochemical cycle, the standard molar enthalpy of formation of the compound has been determined, Δ f H om (C 10 H 16 , s) = − (161 . 83 ± 3 . 55) kJ mol − 1.

Full paper in Portable Document Format: 594a225.pdf

Chemical Papers 59 (4) 225–229 (2005)