论文部分内容阅读
“White powdery tungstic acid” has been used for preparing various types of tungsten-containing compounds due to its high reactivity. The present paper covers the standard molar enthalpies of formation, △H0/f of three tungsten- containing acids. The values found for “white powdery tungstic acid” WO3·1. 68H2O, “yellow tungstic acid” WO3·1. 20H2O and dodecatungstophosphoric acid H3(PW12O40)·25H2O at 298. 15 K were-(1312±1), - (1192±1) and -(18150±13) kJ mol-1, respectively.
“White powdery tungstic acid ” has been used for preparing various types of tungsten-containing compounds due to its high reactivity. The present paper covers the standard molar enthalpies of formation, ΔH0 / f of three tungsten-containing acids. The values found for “white powdery tungstic acid” WO3 · 1 .68H2O, “yellow tungstic acid” WO3 · 1 .20H2O and dodecatungstophosphoric acid H3 (PW12O40) · 25H2O at 298. 15 K were- (1312 ± 1), - (1192 ± 1) and - (18150 ± 13) kJ mol-1, respectively.