✦ LIBER ✦

Kinetics of iodination of hydrogen sulfide by iodine and the heat of formation of the SH radical

✍ Scribed by R. J. Hwang; S. W. Benson

Publisher: John Wiley and Sons
Year: 1979
Tongue: English
Weight: 186 KB
Volume: 11
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550110604

No coin nor oath required. For personal study only.

✦ Synopsis

The kinetics of the gas-phase thermal iodination of hydrogen sulfide by 12 to yield HSI and HI has been investigated in the temperature range 555-595 K. The reaction was found to proceed through an I atom and radical chain mechanism. Analysis of the kinetic data yields log k (l/mol-sec) = (11.1 f 0.18) -(20.5 f 0.44)/8, where 8 = 2.303RT, in kcal/mol. Combining this result with the assumption E-1 = 1 f 1 kcal/mol and known values for the heat of formation of HzS, 12, and HI, AH&g8(SH) = 33.6 f 1.1 kcal/mol is obtained. Then one can calculate the dissociation energy of the HS-H bond as 90.5 f 1.1 kcal/mol with the well-known values for &Y&98 of H and H2S.

📜 SIMILAR VOLUMES

Kinetics of the gas-phase reaction of al

Kinetics of the gas-phase reaction of allyl alcohol with iodine. The heat of formation and stabilization energy of the hydroxyallyl radical

✍ Ze'ev B. Alfassi; David M. Golden 📂 Article 📅 1973 🏛 John Wiley and Sons 🌐 English ⚖ 430 KB

## Abstract The reaction of iodine with allyl alcohol has been studied in a static system, following the absorption of visible light by iodine, in the temperature range 150‐190°C and in the pressure range 10‐200 torr. The rate‐determining step has been found to be equation image and __k__~3~ is c

The rate of the gas phase iodination of

The rate of the gas phase iodination of cyclobutane. The heat of formation of the cyclobutyl radical

✍ D. F. McMillen; D. M. Golden; S. W. Benson 📂 Article 📅 1972 🏛 John Wiley and Sons 🌐 English ⚖ 381 KB

The gas phase iodination of cyclobutane was studied spectrophotometrically in a The early stage of the reaction static system over the temperature range 589" to 662°K. was found to correspond to the general mechanism where the Arrenius parameters describing kl are given by log kl/M-' sec-' = 1 1.

The kinetics and thermochemistry of the

The kinetics and thermochemistry of the gas phase reaction of cyclopentadiene and iodine. Relevance to the heat of formation of cyclopentadienyl iodide and cyclopentadienyl radical

✍ Shozo Furuyama; David M. Golden; Sidney W. Benson 📂 Article 📅 1971 🏛 John Wiley and Sons 🌐 English ⚖ 492 KB 👁 1 views

## Abstract The rate of the reaction of cyclopentadiene with iodine has been followed spectrophotometrically over the temperature range 171.7° to 276.5°C. The reaction first proceeds almost to the point of equilibrium with cyclopentadienyl iodide and HI, although the final products are fulvalene an

Kinetics and mechanism of the hydrolytic

Kinetics and mechanism of the hydrolytic disproportionation of iodine

✍ Krisztina Sebők-Nagy; Tamás Körtvélyesi 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 101 KB 👁 1 views

## Abstract Kinetics of the hydrolytic disproportionation of I~2~ equation image was studied by UV–VIS spectrophotometry at 298 K and at the ionic strength 0.2 M (NaClO~4~) in buffered solutions in the pH range 8.91–10.50 at different initial iodide concentrations. The characterization of this re

Kinetics and mechanism of the iodine oxi

Kinetics and mechanism of the iodine oxidation of hydroxylamine

✍ Robert T. Wang; Gyula Rábai; Kenneth Kustin 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 405 KB 👁 1 views

Studies of the stoichiometry and kinetics of the reaction between hydroxylamine and iodine, previously studied in media below pH 3, have been extended to pH 5.5. The stoichiometry over the pH range 3.4-5.5 is 2NHzOH and k l , kz, Kp, and KI are (6.5 2 0.6) x lo5 M-' s-', (5.0 2 0.5) s-', 1 x lo6 M-

Heat of formation of the vinyl radical

✍ R. B. Sharma; N. M. Semo; W. S. Koski 📂 Article 📅 1985 🏛 John Wiley and Sons 🌐 English ⚖ 166 KB

Over the past several years, a controversy has developed over the value of the heat of formation of the vinyl radical. Reported values for AHf(C2H3) range from 59.6 kcal/mol [l] to 71.5 kcal/mol [2] and even higher values can be cited from earlier work. Recently, Ayranci and Back [31 reported a valu