STUDIES OF RDX AND RELATED COMPOUNDS: VIII. THERMOCHEMISTRY OF RDX REACTIONS
The following heats of reaction have been determined, where the subscripts "c" and "s" refer to solid and solution respectively:Hexamine(c) + HNO3 (97.5%) = RDX(s); ΔH = −88.0 kcal. per mole.Hexamine mononitrate(c) + HNO3 (97.5%) = RDX(s); ΔH = −69.2 kcal. per mole.Hexamine dinitrate(c) + HNO3 (97.5%) = RDX(s); ΔH = −41.7 kcal. permole.Hexamine(s) + Bachmann reagents = RDX(s); ΔH = −140 kcal. per mole.Hexamine mononitrate(s) + Bachmann reagents = RDX(s); ΔH = −126 kcal. per mole.Hexamine dinitrate(c) + Bachmann reagents = RDX(s); ΔH = −118 kcal. per mole.These measurements, together with some on heats of solution of the reagents, indicate that hexamine dinitrate is an intermediate in the direct nitrolysis of hexamine to RDX, but that hexamine mononitrate is a probable intermediate in the Bachmann conversion of hexamine to RDX.
THE SOLUBILITIES OF CERTAIN AMINO ACIDS AND RELATED COMPOUNDS IN WATER, THE DENSITIES OF THEIR SOLUTIONS AT TWENTY-FIVE DEGREES, AND THE CALCULATED HEATS OF SOLUTION AND PARTIAL MOLAL VOLUMES. II