ENTHALPIES OF COMBUSTION AND FORMATION OF 11 ISOMERIC NONANES

The enthalpies of combustion of 11 isomeric nonanes were determined by oxygenbomb combustion calorimetry. Enthalpies of combustion were computed from measurements of mass of samples burned and mass of carbon dioxide produced. The following values, in kilocalories per mole based on the mass of sample, are reported for the standard enthalpy of combustion, ΔHc°298.15, of these compounds in the liquid state: n-nonane, -1463.96 ± 0.13; 2,2-dimethyl heptane, -1460.74 ± 0.20; 2,2,3-trimethylhexane, -1462.05 ± 0.18; 2,2,4-trimethylhexane, -1462.01 ± 0.20; 2,2,5-trimethylhexane, -1459.50 ± 0.20; 2,3,3-trimethyl hexane, -1462.43 ± 0.20; 2,3,5- trimethylhexane, -1461.73 ± 0.20; 2,4,4-trimethylhexane, -1462.65 ± 0.18; 3,3,4-trimefhylhexane, -1463.28 ± 0.18; 2,2-dimethyl-3-ethylpentane, -1464.44 ± 0.18; and 2,4-dimethyl-3-ethylpentane, -1465.15 ± 0.18. The experimental results for these compounds were compared to values predicted by current correlative procedures. © 1969, American Chemical Society. All rights reserved.