Heats of combustion and formation of trimethylborane, triethylborane, and tri-n-butylborane

Abstract

The heats of combustion at 25 degrees C of trimethylborane (liquid), triethylborane (liquid), and tri-n-butylborane (liquid), to form crystalline boric acid, liquid water, and gaseous carbon dioxide have been determined to be -2989.4 ±22.4 kj/mole (-714.48 ±5.36 kcal/mole),-4975.6±15.1 kj/mole (-1189.2±3.6 kcal/mole), and -901.0±10.2 kj/mole (-2127.4±2.4 kcal/mole), respectively. These data, combined with the heats of formation of boric acid, carbon dioxide, and water give -34.79 ±5.40, -47.2 ±3.7, and -83.2 ±2.5 kcal/mole at 25 degrees C for the standard heats of formation of trimethylborane, triethylborane, and tri-n-butylborane, respectively. The data of other investigators a rediscussed briefly.