Literaturnachweis - Detailanzeige
Autor/inn/en | Halpern, Arthur M.; Liu, Allen |
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Titel | Gas Nonideality at One Atmosphere Revealed through Speed of Sound Measurements and Heat Capacity Determinations |
Quelle | In: Journal of Chemical Education, 85 (2008) 11, S.1568-1570 (3 Seiten)Infoseite zur Zeitschrift
PDF als Volltext |
Sprache | englisch |
Dokumenttyp | gedruckt; online; Zeitschriftenaufsatz |
ISSN | 0021-9584 |
Schlagwörter | Molecular Structure; Measurement Techniques; Science Experiments; Laboratory Experiments; Computation; Chemistry; College Science; Science Instruction; Acoustics; Scientific Concepts |
Abstract | Using an easy-to-make cylindrical resonator, students can measure the speed of sound in a gas, u, with sufficiently high precision (by locating standing-wave Lissajous patterns on an oscilloscope) to observe real gas properties at one atmosphere and 300 K. For CO[subscript 2] and SF[subscript 6], u is found to be 268.83 and 135.25 m s[superscript -1], respectively, versus their ideal-gas (zero-pressure) values of 270.15 and 136.67 m s[superscript -1]. These differences arise from intermolecular interactions. It is shown that if the molar isobaric heat capacities, C[subscript p], m, are calculated from the one atmosphere u values assuming perfect gas behavior, significant errors are produced. For CO[subscript 2] and SF[subscript 6] these errors are 2.7% and 25%, respectively. Experimental C[subscript p], m values are compared with those obtained based on the equipartition theorem. (Contains 1 figure and 2 tables.) (As Provided). |
Anmerkungen | Division of Chemical Education of the American Chemical Society. Subscription Department, P.O. Box 1267, Bellmawr, NJ 08099-1267. Tel: 800-691-9846; Tel: 856-931-5825; Fax: 856-931-4115; e-mail: jchemed@egpp.com; Web site: http://www.jce.divched.org |
Erfasst von | ERIC (Education Resources Information Center), Washington, DC |
Update | 2017/4/10 |