2906.     ROSSINI, F. D.  Heat of Combustion of Methanol.  Proc. Nat. Acad. Sci., United States, vol. 17, 1931, pp. 343-347; Chem. Abs., vol. 25, 1931, p. 4773.

        With the same calorimetric apparatus and procedure that was used for H₂, CH₄, and CO, the heat of the reaction CH₃OH (g)+3/2 O₂ (g)=CO₂ (g)+2H₂O (l) was found to be 763.77±0.20 internat. kilojoules/mol. at 25°.  By combining with this value the data of Flock, Ginnings, and Holton on the heat of vaporization of CH₃OH, the heat of combustion of CH₃OH (l) is computed to be 726.34±0.20 internat. kilojoules/mol. at 25°, or, with the factor 1.0004/4.185, 173.63±0.05 kg.-cal₁₅.  The value obtained by Richards and Davis is about 1.5% lower than this, while that of Thomsen agrees with it within the assigned limits of error.  In the present experiments CH₃OH was vaporized by a stream of dry air and burned in an excess of O₂.  Tests were made to determine the purity of the reaction.  No CO was found, and only negligible amounts of N oxides and HCHO.