Abstract
The energy of combustion in fluorine of orthorhombic black phosphorus has been measured. On the basis of this result and a similar earlier measurement on α-white phosphorus, the enthalpy of the P(α, white) = P(orthorhombic, black) transition was found to be −(21.2 ± 2.1) kJ mol −1. Our earlier reported value for Δ f H XXX m(PF 5, g, 298.15 K) [Trans. Faraday Soc., 62 (1966) 2709] is revised slightly to −(1593.6 ± 1.2) kJ mol −1.
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