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The heats of isomerization of six of the nonanes were dete rmined by measure ment of the rat ios of the heats of combustion in the liquid state of purifi ed samples of these compounds by t he procedure prev iously described for other hydrocarbons. The data yield t he foll owing values for the heat of isomerization in the liquid state at 25° C , !1Ho, of n-nonane in to the other nonanes, in k ilocalories per mole : n-No nane, 0.00 ; 3,3-diethy lpentane, 0.01 ± 0.33 ; 2,2,3,3-tetra methyl pentane, 0.70 ± 0. 31; 2,2,3,4-tetramethylpentane, 0.56 ± 0.22 ; 2,2,4,4-tetra methylpentane, 1.] 1. ± 0.25; 2,3,3,'1-tetramethylpentane, 0.62 ± 0.35. These data were combin ed with t he value previously repo rted for the heat of combus t ion of n-non a ne to obtain values fol' t he heats of com bust ion o r the other fiv e nonanes in the liquid s tate at 25° C.

Heats of combustion and isomerization of 6 nonanes