Second virial coefficients of tetrachloromethane from measurements of the excess molar enthalpy ofyN2+ (1−y)CCl4over the temperature range 333.2 K to 413.2 K

✍ Scribed by C.J. Wormald; N.M. Lancaster

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 349 KB
• Volume: 28
• Category: Article
• ISSN: 0021-9614
• DOI: 10.1006/jcht.1996.0024

✦ Synopsis

Values of the second virial coefficient B for tetrachloromethane have been obtained from measurements of the excess molar enthalpy H E m of {yN2+(1-y)CCl4} made at pressures in the range 48.8 kPa to 93.8 kPa and at temperatures from 333.2 K to 413.2 K. The values of B derived from the measurements are accurate to 24 per cent, and are fitted by the Kihara spherical core potential with the parameters o/k=627 K, s=0.616 nm, and a=0.1 nm. The new values of B are approximately 5 per cent less negative than values obtained by ( p,V,T) which are in error due to reaction with mercury. Comparison with reduced second virial coefficients for some other globular molecules shows that the measurements deviate in a systematic way from the principle of corresponding states. Cross-term second virial coefficients B12 were calculated from the Kihara potential for mixtures of CCl4 with five light gases and were found to be in excellent agreement with values of B12 obtained from measurements of the solubility of CCl4 in the compressed gas.