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Thermodynamic properties of vanadium silicides. I. Standard molar enthalpy of formationΔfHmoof vanadium disilicide (VSi2) at the temperature 298.15 K

✍ Scribed by P.A.G. O’Hare; K. Watling; G.A. Hope

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
145 KB
Volume
31
Category
Article
ISSN
0021-9614

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✦ Synopsis

The massic energy of combustion of vanadium disilicide in fluorine according to the reaction VSi 2 (cr) + (13/2)F 2 (g) = VF 5 (g) + 2SiF 4 (g) has been measured calorimetrically. On the basis of the derived molar enthalpy of reaction and the standard molar enthalpies of formation f H o m of VF 5 (g) and SiF 4 (g), f H o m (VSi 2 , cr, 298.15 K) = -(133.3 ± 2.0) kJ • mol -1 at T = 298.15 K and p = 0.1 MPa. This result is compared with other values of f H o m (VSi 2 ) from the literature. The complete conventional thermodynamic properties of VSi 2 are also tabulated between the temperatures 298.15 K and 1950 K.

📜 SIMILAR VOLUMES

Thermodynamic properties of vanadium sil
Thermodynamic properties of vanadium silicides II. Standard molar enthalpy of formationΔfHmo(298.15 K) and reassessed thermodynamic properties of trivanadium monosilicide (V3Si)
✍ P.A.G. O’Hare; K. Watling; G.A. Hope 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 146 KB

Fluorine bomb combustion calorimetric measurements of the energy of the reaction: V 3 Si(cr) + (19/2)F 2 (g) = 3VF 5 (g) + SiF 4 (g), have given a value of -(163.3 ± 6.9) kJ • mol -1 for the standard molar enthalpy of formation f H o m (V 3 Si, cr) at T = 298.15 K and p o = 101.325 kPa. This result