Corrected Heats of Combustion of Organic Iodine Compounds.

Combustion calorimetry on samples of mass less than 10 mg of substances containing iodine with a CRMT rocking-bomb calorimeter. Application to the study ofp-iodobenzoic acid

“…Our result for the standard molar enthalpy of combustion of p-iodobenzoic acid, −(3154.2 2 1.3) kJ·mol −1 , is in very good agreement with the only old value (9) using classical combustion calorimetry, recalculated by Smith (10) and reported by Cox and Pilcher (11) as −(3153.12 4.2) kJ·mol −1 . We conclude that in the case of substances containing iodine the CRMT rocking calorimeter is also useful for accurate determination of the enthalpy of combustion using only a small mass of substance; {5E(m/mg)E10} for each combustion developing a heat of about 0.1 kJ.…”

Standard enthalpies of combustion of five halogen-substituted 8-hydroxyquinolines by rotating-bomb calorimetry

“…The standard massic energy of combustion of 2-iodobenzoic acid, measured by the static-bomb method, has been reported previously by Smith: (22) −(12767.521.7) J·g −1 . The value reported in this paper and derived using the same method: −(12770.721.3) J·g −1 , is very close.…”

Standard molar enthalpy of formation of 4-iodobenzoic acid by static and rotating-bomb calorimetry

“…(5) The good agreement obtained between the values of c H o m determined by the static and the rotating-bomb methods, for the two isomers of iodobenzoic acid, suggests that the static method would probably lead to results as accurate as could be obtained by the rotatingbomb method. However, before definite conclusions can be presented, it is desirable to extend this investigation to other organo-iodine compounds.…”

“…This value is also in agreement, within the uncertainties associated, with the other literature values. (5,6) We recommend the adoption of 4-iodobenzoic acid as a test substance in bomb combustion calorimetry of organo-iodine compounds.…”

“…Karlsson (2) measured, by the static-bomb method, the standard massic energy of combustion of the three isomers of iodobenzoic acid and Smith (5) has recalculated the results. For 4-iodobenzoic acid another value has been reported, (6) determined using a rotating-bomb calorimeter.…”