title: Standard molar enthalpy of combustion and formation of quaternary ammonium tetrachlorozincate [n-CnH2n+1 N(CH3)3]2 ZnCl4.
abstract: The standard molar enthalpy of combustion (Δc H (o) m) and formation (Δf H (o) m) of quaternary ammonium tetrachlorozincate [n-CnH2n+1N(CH3)3]2ZnCl4 have been determined for the hydrocarbon chain length from even number 8 to 18 of carbon atoms (n) by an oxygen-bomb combustion calorimeter. The results indicated that the values of Δc H (o) m increased and Δf H (o) m decreased with increasing chain length and showed a linear dependence on the number of carbon atoms, which were caused by that the order and rigidity of the hydrocarbon chain decreased with increasing the carbon atoms. The linear regression equations are -Δc H (o) m =1440.50n +3730.67 and -Δf H (o) m = -85.32n + 1688.22.
authors.affiliation: Department of Chemistry and Material Science, Hebei Normal University, Shijiazhuang, 050024 China.
authors.forename: Biyan
authors.initials: B
authors.lastname: Ren
authors.forename: Shuying
authors.initials: S
authors.lastname: Zhang
authors.forename: Bei
authors.initials: B
authors.lastname: Ruan
authors.forename: Kezhong
authors.initials: K
authors.lastname: Wu
authors.forename: Jianjun
authors.initials: J
authors.lastname: Zhang
keywords: Combustion calorimeter; Energy of combustion; Enthalpy of combustion; Enthalpy of formation; Quaternary ammonium tetrachlorozincate