THE THERMODYNAMIC AND PHYSICAL PROPERTIES OF BERYLLIUM COMPOUNDS. II. HEAT OF FORMATION AND ENTROPY OF BERYLLIUM(I) FLUORIDE

Journal Article · Fri Mar 01 04:00:00 EST 1963 · Journal of Physical Chemistry (U.S.)

DOI:https://doi.org/10.1021/j100797a040· OSTI ID:4712890

Greenbaum, M A; Yates, R E; Arin, M L; Arshadi, M; Weiher, J; Farber, M

The molecular flow effusion method was employed to obtain second and third law heats of formation of BeF(g) from a study of the reaction BeF/sub 2/(g) + Be(s,l) = 2BeF(g) over the temperature range 1425 to 1675 deg K. The DELTA H of reaction was found to be 91.5 plus or minus 3.8 kcal/mole, while the corresponding entropy of reaction was found to be 44.3 plus or minus 2.4 cal/ deg/mole. Employing recent experimental data together with available thermal functions for the constituents, a value of -48.3 plus or minus 1.9 kcal/mole is obtained for DELTA H/sub f298/ BeF(g) and 51.1 plus or minus 1.2 cal/deg/mole for the S/sub 298/ BeF. The third law value for DELTA H/sub f298/ of BeF(g) was found to be -52.6 plus or minus 0.6 kcal/mole. (auth)

• Research Organization: Rocket Power, Inc., Pasadena Calif.
• Sponsoring Organization: USDOE
• NSA Number: NSA-17-028871
• OSTI ID: 4712890
• Journal Information: Journal of Physical Chemistry (U.S.), Journal Name: Journal of Physical Chemistry (U.S.) Vol. Vol: 67; ISSN JPCHA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BERYLLIUM COMPOUNDS
BERYLLIUM FLUORIDES
CHEMISTRY
DIFFUSION
ENTHALPY
ENTROPY
HIGH TEMPERATURE
THERMODYNAMICS