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The determll1ation of the heat of formation of boric oxide glass by the combustion of boron in oxygen has led to values which ran.ge from 279.9 to 368 kcal/mole. Roth and Borger [1,2]1 obtained a value of 340 ± 3 kcal/mole from the combustion of boron in an oxygen bomb with paraffin oil as an auxiliary substance to aid the reaetion. Robe rtson [3] obtained a value of -368 ± 17 kcal/mole from the co:n:t?ustion of boron in an oxygen bomb using no auxilIary substance other than a cotton string fuse. Todd and Miller [4] obtained a value of -338.4 ± 0.8 kcal/mole from the combustion of boron in an oxygen bomb wi til b enzoi c acid as an auxiliary substance. Eggersgluess , Monroe, and Parker [5] obtained a value of 281.1 ± :3.1 kcal/ mole from the combustion of boron in a n oxygen bomb WIth paraffin oil and lamp blade as auxilia ry substances. In all of these determinations, eomplete combustion of the boron was not achieved and the amount of reaction was determined from a titration of the boric acid formed by dissolving the soluble prod~lcts of combustion in water. Nathan [6] obtall1ed a value of 306 ± 3 kcal/mole from the combustion in an oxygen bomb using iron wiTe as an auxiliary substance. In this case . complete combust.ion of t llC boron was achieved although the oveL'-all uncertainty was rather high. Bichowsky and Rossini [7] calculated a value of 279.9 kcai/ mole for t he heat of formation of boric oxide glass from the data existing in the literature prior to 1934. An i nvestigaLion of the . combustion of powdered amorphous boron (obtained from experiments on the decomposition of diborane) ill an oxygen bomb has been made. It was found possible to ignite the boron with a fuse of iron wire, but complete combustion of the boron was not obtained. The addition of relatively large quantities of benzoic acid did not effect the complete combustion of the boron.

Heat of reaction of diborane with water and the heat of formation of boric oxide