Standard heats of formation of the sodium triphosphates Na5P3O10(cI), Na5P3O10(cII) and Na5P3O10˙ 6H2O(c)
Abstract
The standard heats of formation of Na5P3O10(c) phases I and II and Na5P3O10˙ 6H2O(c) have been determined by solution calorimetry. The values obtained are : ΔH°f 298Na5P3O10(cI)=– 1056.5±1.5 kcal mole–1, ΔH°f 298Na5P3O10(cII)=–1059.1±1.5 kcal mole–1, ΔH°f 298Na5P3O10˙ 6H2O(c)=–1485.7±1.6 kcalzmole–1.