Using
an oxygen-bomb combustion calorimeter, the molar combustion heats of the ionic
liquids 1-alkyl-3-methylimidazolium Bromine
([Cnmim] Br,
where n=8, 10, 12, 14 and 16) were determined at (298.150±0.001) K. The
standard molar combustion enthalpies ΔcHmΘand the
standard molar formation enthalpies Δf HmΘ were
calculated. The contribution of one methylene group to the ΔcHmΘ , and Δf HmΘ was also estimated,
respectively. The reliability of instrument was tested by naphthalene, the
relative error was 0.15%; for the comparison between the experimental
value and literature value about the standard combustion enthalpy of
naphthalene.