Neue Versuche mit beweglicher calorimetrischer Bombe

Smith, Lennart; Bjellerup, Lars; Sillén, Lars Gunnar; Linnasalmi, Annikki; Laukkanen, Pentti

doi:10.3891/acta.chem.scand.01-0566

Cited by 3 publications

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“…Especially desirable for confirmation of th e ideal-gas properties would be precise me asurements of the vapor heat c apacity, sin ce th e calculated heat capacity is much more sensitive than is the e ntropy to frequency values and anharmonicities . Tables 3 and 4 can be e xtended to include the th e rmodynami c function s for formation of bromobe nzen e from th e ele me nts, by appli cation of the heat of formation determined by Smith and Bj e lJerup [36].…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Some thermodynamic properties of bromobenzene from 0 to 1500 K

Masi¹,

Scott²

1975

J. RES. NATL. BUR. STAN. SECT. A.

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M eas ure me nt s we re mad e o f th e h ea t ca pac it y of c r ys ta llin e and liq uid bro mobe nze ne from 11 to 300 K, of th e tripl e point and hea t o f fu s ion at th e tripl e point and o f th e hea t of vapo ri za ti o n a t one te mp e rature . Th e ad iaba ti c ca lorim e te r used was precise over mos t of its ra nge to ± O.l pe rce nt ; th e pu rit y of th e sa mpl e was 99.998 mo l pe rce nt. Th e tripl e point of pure b ro mobe n ze ne is 242.401 K (-30. 749 °C) ± O.OlO": th e e ntha lpy a nd e nt rop y uf fu s io n a re, res pec tive ly, 10702 ± 5 J mol-I a nd 44. 150 ± 0.022 J K I mo l-I. Th c hea t a nd e ntropy of vaporization a t 293. 00 K are, res pec tive ly, 43963 ± 60 J mo l-I a nd 150.0 ± 0.2 J K-I mol-I. Tabl es are gi ve n for th e th er mody na mi c fun c tion s of th e co nd e nsed pha ses fro m 0 to 300 K; th e fun c ti o ns fo r th e id ea l gas fro m 100 to 1500 K, ca lc ul a te d from s pectroscop ic a nd mo lecu la r data us in g stati sti ca l mec ha ni ca l me thod s, a re a ls o tabu la ted. Th e e ntropy of th e idea l gas a t 293.00 K a nd o ne a tm osp he re. from s ta ti s ti ca l mec h an ics, is 323.63 J K-I mo l-I: th e sa me q uan tit y fro m th e ex p erim e n ta l me as ureme nts (third law) is 323.73 .J K-I mo l-I. No a no ma lies o r a ddit iona l tra ns iti o ns we re obse r ved.Key word s : Bro mo be n ze ne; ca lorim e try; e nth a lp y; e ntrop y; C ibbs e ne rgy; hea t c apacit y; hea t off'u s io n; he a t of vaporiza ti o n: th e rm ody na mi c prop e rti es , tripl e po int.

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Section: Discussion Of Resultsmentioning

confidence: 99%

Some thermodynamic properties of bromobenzene from 0 to 1500 K

Masi¹,

Scott²

1975

J. RES. NATL. BUR. STAN. SECT. A.

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“…Brom compounds LIX Bromobenzene, C6H5Br, 24 44.5 [59] ±0.04 3111.9 [74] ±0.67 60.9 [75] ±4.1 219.2 [76] 154.3 [76] LX Ethylbromide, C2H5Br, 8 28.3 [27] 105.8 [70] 63.6 [77] LXI n-Propylbromide, C3H7Br, 14 31.9 [27] ±0.08 2056.6 [78] ±1.4…”

Section: Title Of Compound Formula N-gh Free Energy Enthalpy (Heat mentioning

confidence: 99%

Thermochemistry of Heteroatomic Compounds: Analysis and Calculation of Thermodynamic Functions of Organic Compounds of V-VII Groups of Mendeleev′s Periodic Table

Ovchinnikov¹

2013

AJPC

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The heat of vaporization (∆ vap Н o), all thermodynamic functions ∆ с,f G o , ∆ с,f H o , S o , ∆ c S o cond and heat capacity (C p) of organic compounds of V-VII groups of Mendeleev′s Periodic Table can be well characterized with the number of valence electrons N without taking into account the number (h) of lone electrons pairs (g) of them in equation ∆ vap,c,f,s Ψ o = i ± f *(Nhg). The stoichiometric coefficients i and f reflect partially a various spatial structure of all investigated compounds. The free energy and entropy of combustion and formation are calculated only for oxygen, sulfur and partly fluorine compounds. For this reason their analysis causes the certain difficulties. It is possible to note, that f coefficients in the given above equation for free energies of combustion are very close to such coefficients for the heat of combustion processes. Also it has been found that calculated thermodynamic functions of ethers and sulfides are in good interdependence from each other: ∆ с Н o-∆ с S o cond , ∆ f Н o-S o cond , S o cond-C p. The 74 equations of mentioned type have been created for processes of vaporization, combustion, formation, entropic transformations and heat capacity.

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Thermochemistry of Heteroatomic Compounds: Analysis and Calculation of Thermodynamic Functions of Organometallic Compounds of I-IV Groups of Mendeleev′s Periodic Table

Ovchinnikov¹

2013

AJPC

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It is necessary to note, that the heat of vaporization, all thermodynamic functionscond and heat capacity (C p ) of organometallic compounds of I-IV groups of Mendeleev′s Periodic Table can be well characterized with the number of valence electrons N of them. It is difficult to do some conclusions relatively stoichiometric coefficients i and f in modified by us Kharasch equation ∆ vap,c,f,s Ψ o = i ± f *N as they concern to organometallic compounds of the different groups. Such conclusion can be made on settlement data of I and II groups only in our opinion. Nevertheless, 43 equations of this type have been created for the processes of vaporization, combustion, formation, entropic transformations and heat capacity. Probably, that such data will help with forecasting of thermochemical functions and parameters of yet not investigated organometallic compounds.

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Neue Versuche mit beweglicher calorimetrischer Bombe

Cited by 3 publications

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Some thermodynamic properties of bromobenzene from 0 to 1500 K

Some thermodynamic properties of bromobenzene from 0 to 1500 K

Thermochemistry of Heteroatomic Compounds: Analysis and Calculation of Thermodynamic Functions of Organic Compounds of V-VII Groups of Mendeleev′s Periodic Table

Thermochemistry of Heteroatomic Compounds: Analysis and Calculation of Thermodynamic Functions of Organometallic Compounds of I-IV Groups of Mendeleev′s Periodic Table

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