Measurements of the heat of hydrolysis of crystalline phosphorus pentachloride at 25 °C are reported. In conjunction with the available standard heat of formation of PCl5, cryst., (ΔH∘f=–106.0 kcal/mole), the hydrolysis measurements lead to ΔH∘f[H3PO4, (in 100 H2O)]=–309.80 ± 0.35 kcal/mole.
G. I. Birley and H. A. Skinner, Trans. Faraday Soc., 1968, 64, 3232 DOI: 10.1039/TF9686403232
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