Atomization energies of the gaseous molecules LaC and La sub 2 C by high-temperature equilibrium measurements
The Knudsen effusion mass spectrometric technique has been used to determine the thermodynamic properties of the molecules LaC and La{sub 2}C. The enthalpies of the reactions La(g) + C(graphite) = LaC(g) and 2La(g) + C(graphite) + La{sub 2}C(g) were measured in two runs in the temperature ranges 228...
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| Veröffentlicht in: | Journal of physical chemistry (1952) 1989-02, Vol.93:4 |
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| container_title | Journal of physical chemistry (1952) |
| container_volume | 93:4 |
| creator | Pelino, M. Gingerich, K.A. |
| description | The Knudsen effusion mass spectrometric technique has been used to determine the thermodynamic properties of the molecules LaC and La{sub 2}C. The enthalpies of the reactions La(g) + C(graphite) = LaC(g) and 2La(g) + C(graphite) + La{sub 2}C(g) were measured in two runs in the temperature ranges 2286-2609 and 2767-2835 K, respectively, resulting in {Delta}H{sub 0}{degree} (reaction 1) = 253 {plus minus} 18 kJ mol{sup {minus}1} and {Delta}H{sub 0}{degree} (reaction 2) = -234 {plus minus} 25 kJ mol{sup {minus}1}. From these values the atomization energies, {Delta}H{sub a}{degree}{sub 0}, and standard heats of formation, {Delta}H{sub f}{degree}{sub 298.15}, were obtained as 458 {plus minus} 20 and 685 {plus minus} 20 and 685 {plus minus} 20 kJ mol{sup {minus}1} for LaC and 945 {plus minus} 28 and 625 {plus minus} 28 kJ mol{sup {minus}1} for La{sub 2}C. |
| doi_str_mv | 10.1021/j100341a077 |
| format | Article |
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The enthalpies of the reactions La(g) + C(graphite) = LaC(g) and 2La(g) + C(graphite) + La{sub 2}C(g) were measured in two runs in the temperature ranges 2286-2609 and 2767-2835 K, respectively, resulting in {Delta}H{sub 0}{degree} (reaction 1) = 253 {plus minus} 18 kJ mol{sup {minus}1} and {Delta}H{sub 0}{degree} (reaction 2) = -234 {plus minus} 25 kJ mol{sup {minus}1}. From these values the atomization energies, {Delta}H{sub a}{degree}{sub 0}, and standard heats of formation, {Delta}H{sub f}{degree}{sub 298.15}, were obtained as 458 {plus minus} 20 and 685 {plus minus} 20 and 685 {plus minus} 20 kJ mol{sup {minus}1} for LaC and 945 {plus minus} 28 and 625 {plus minus} 28 kJ mol{sup {minus}1} for La{sub 2}C.</description><identifier>ISSN: 0022-3654</identifier><identifier>EISSN: 1541-5740</identifier><identifier>DOI: 10.1021/j100341a077</identifier><language>eng</language><publisher>United States</publisher><subject>400201 - Chemical & Physicochemical Properties ; CARBIDES ; CARBON COMPOUNDS ; DATA ; DISSOCIATION HEAT ; ENTHALPY ; EXPERIMENTAL DATA ; FLUIDS ; GASES ; HIGH TEMPERATURE ; INFORMATION ; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ; LANTHANUM CARBIDES ; LANTHANUM COMPOUNDS ; MASS SPECTROSCOPY ; NUMERICAL DATA ; PHYSICAL PROPERTIES ; RARE EARTH COMPOUNDS ; REACTION HEAT ; SPECTROSCOPY ; THERMODYNAMIC PROPERTIES ; THERMODYNAMICS</subject><ispartof>Journal of physical chemistry (1952), 1989-02, Vol.93:4</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,780,784,885,27924,27925</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/5040240$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Pelino, M.</creatorcontrib><creatorcontrib>Gingerich, K.A.</creatorcontrib><title>Atomization energies of the gaseous molecules LaC and La sub 2 C by high-temperature equilibrium measurements</title><title>Journal of physical chemistry (1952)</title><description>The Knudsen effusion mass spectrometric technique has been used to determine the thermodynamic properties of the molecules LaC and La{sub 2}C. The enthalpies of the reactions La(g) + C(graphite) = LaC(g) and 2La(g) + C(graphite) + La{sub 2}C(g) were measured in two runs in the temperature ranges 2286-2609 and 2767-2835 K, respectively, resulting in {Delta}H{sub 0}{degree} (reaction 1) = 253 {plus minus} 18 kJ mol{sup {minus}1} and {Delta}H{sub 0}{degree} (reaction 2) = -234 {plus minus} 25 kJ mol{sup {minus}1}. From these values the atomization energies, {Delta}H{sub a}{degree}{sub 0}, and standard heats of formation, {Delta}H{sub f}{degree}{sub 298.15}, were obtained as 458 {plus minus} 20 and 685 {plus minus} 20 and 685 {plus minus} 20 kJ mol{sup {minus}1} for LaC and 945 {plus minus} 28 and 625 {plus minus} 28 kJ mol{sup {minus}1} for La{sub 2}C.</description><subject>400201 - Chemical & Physicochemical Properties</subject><subject>CARBIDES</subject><subject>CARBON COMPOUNDS</subject><subject>DATA</subject><subject>DISSOCIATION HEAT</subject><subject>ENTHALPY</subject><subject>EXPERIMENTAL DATA</subject><subject>FLUIDS</subject><subject>GASES</subject><subject>HIGH TEMPERATURE</subject><subject>INFORMATION</subject><subject>INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY</subject><subject>LANTHANUM CARBIDES</subject><subject>LANTHANUM COMPOUNDS</subject><subject>MASS SPECTROSCOPY</subject><subject>NUMERICAL DATA</subject><subject>PHYSICAL PROPERTIES</subject><subject>RARE EARTH COMPOUNDS</subject><subject>REACTION HEAT</subject><subject>SPECTROSCOPY</subject><subject>THERMODYNAMIC PROPERTIES</subject><subject>THERMODYNAMICS</subject><issn>0022-3654</issn><issn>1541-5740</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1989</creationdate><recordtype>article</recordtype><recordid>eNqNirtOxDAQAC3ESQSOih9Y0YdbP0JqFIEoKOlPjtlLfIptyK4L-HpS8AFUI82MUncaHzQafThrROu0x76_UI3unG673uGlahCNae1j567UNfMZEbW1ulHpSUqKP15iyUCZ1ikSQzmBzASTZyqVIZWFQl228OYH8PljI3AdwcAA4zfMcZpbofRJq5e6EtBXjUsc11gTJPK8uURZeK92J78w3f7xRt2_PL8Pr21hiUcOUSjMoeRMQY4dOjQO7b-mX0PITrE</recordid><startdate>19890223</startdate><enddate>19890223</enddate><creator>Pelino, M.</creator><creator>Gingerich, K.A.</creator><scope>OTOTI</scope></search><sort><creationdate>19890223</creationdate><title>Atomization energies of the gaseous molecules LaC and La sub 2 C by high-temperature equilibrium measurements</title><author>Pelino, M. ; Gingerich, K.A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-osti_scitechconnect_50402403</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1989</creationdate><topic>400201 - Chemical & Physicochemical Properties</topic><topic>CARBIDES</topic><topic>CARBON COMPOUNDS</topic><topic>DATA</topic><topic>DISSOCIATION HEAT</topic><topic>ENTHALPY</topic><topic>EXPERIMENTAL DATA</topic><topic>FLUIDS</topic><topic>GASES</topic><topic>HIGH TEMPERATURE</topic><topic>INFORMATION</topic><topic>INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY</topic><topic>LANTHANUM CARBIDES</topic><topic>LANTHANUM COMPOUNDS</topic><topic>MASS SPECTROSCOPY</topic><topic>NUMERICAL DATA</topic><topic>PHYSICAL PROPERTIES</topic><topic>RARE EARTH COMPOUNDS</topic><topic>REACTION HEAT</topic><topic>SPECTROSCOPY</topic><topic>THERMODYNAMIC PROPERTIES</topic><topic>THERMODYNAMICS</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Pelino, M.</creatorcontrib><creatorcontrib>Gingerich, K.A.</creatorcontrib><collection>OSTI.GOV</collection><jtitle>Journal of physical chemistry (1952)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Pelino, M.</au><au>Gingerich, K.A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Atomization energies of the gaseous molecules LaC and La sub 2 C by high-temperature equilibrium measurements</atitle><jtitle>Journal of physical chemistry (1952)</jtitle><date>1989-02-23</date><risdate>1989</risdate><volume>93:4</volume><issn>0022-3654</issn><eissn>1541-5740</eissn><abstract>The Knudsen effusion mass spectrometric technique has been used to determine the thermodynamic properties of the molecules LaC and La{sub 2}C. The enthalpies of the reactions La(g) + C(graphite) = LaC(g) and 2La(g) + C(graphite) + La{sub 2}C(g) were measured in two runs in the temperature ranges 2286-2609 and 2767-2835 K, respectively, resulting in {Delta}H{sub 0}{degree} (reaction 1) = 253 {plus minus} 18 kJ mol{sup {minus}1} and {Delta}H{sub 0}{degree} (reaction 2) = -234 {plus minus} 25 kJ mol{sup {minus}1}. From these values the atomization energies, {Delta}H{sub a}{degree}{sub 0}, and standard heats of formation, {Delta}H{sub f}{degree}{sub 298.15}, were obtained as 458 {plus minus} 20 and 685 {plus minus} 20 and 685 {plus minus} 20 kJ mol{sup {minus}1} for LaC and 945 {plus minus} 28 and 625 {plus minus} 28 kJ mol{sup {minus}1} for La{sub 2}C.</abstract><cop>United States</cop><doi>10.1021/j100341a077</doi></addata></record> |
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| ispartof | Journal of physical chemistry (1952), 1989-02, Vol.93:4 |
| issn | 0022-3654 1541-5740 |
| language | eng |
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| source | ACS Publications |
| subjects | 400201 - Chemical & Physicochemical Properties CARBIDES CARBON COMPOUNDS DATA DISSOCIATION HEAT ENTHALPY EXPERIMENTAL DATA FLUIDS GASES HIGH TEMPERATURE INFORMATION INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY LANTHANUM CARBIDES LANTHANUM COMPOUNDS MASS SPECTROSCOPY NUMERICAL DATA PHYSICAL PROPERTIES RARE EARTH COMPOUNDS REACTION HEAT SPECTROSCOPY THERMODYNAMIC PROPERTIES THERMODYNAMICS |
| title | Atomization energies of the gaseous molecules LaC and La sub 2 C by high-temperature equilibrium measurements |
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