ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Excess molar volumes of the (cyclohexane + pentane, or hexane, or heptane, or octane, or nonane) systems at the temperature 298.15 K

J. Balán, L. Morávková, and J. Linek

E. Hála Laboratory of Thermodynamics, Institute of Chemical Process Fundamentals, Academy of Sciences of the Czech Republic, 165 02 Prague, Czech Republic

E-mail: linek@icpf.cas.cz

Received: 17 April 2007  Revised: 4 June 2007  Accepted: 6 June 2007

Abstract: The densities of the (cyclohexane + pentane, or hexane, or heptane, or octane, or nonane) systems were measured at the temperature 298.15 K by means of a vibrating-tube densimeter. Their respective excess molar volumes were calculated and correlated using the fourth-order Redlich—Kister equation, with the maximum likelihood principle being applied in the determination of the adjustable parameters. The values of excess molar volumes were negative for the cyclohexane + pentane system, whereas they were positive for the other systems with the values increasing with the number of carbon atoms in the respective alkane molecules.

Keywords: cyclohexane - alkanes - binary mixtures - density - excess volume

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-007-0068-6

Chemical Papers 61 (6) 497–501 (2007)