The Thermal Equilibrium Between Ethylene Iodide, Ethylene and Iodine
Abstract
The thermal equilibrium between ethylene iodide, ethylene and iodine in the vapor state has been studied in the temperature range 50 to 125°C. The method devised involved measurements of the iodine vapor pressure by a photometric device utilizing photronic cells in a null-point arrangement. Iodine and ethylene iodide were both present as unsaturated vapors. The measurements gave results which were found to agree with the extrapolation of Mooney and Ludlam's data for lower temperatures, but to disagree with the same authors' higher temperature determinations. The heat of dissociation of ethylene iodide is 13.4±0.5 kcal. The position of equilibrium is given by: log K = — 13,400/4.58T+8.17, where the equilibrium constant is expressed in atmospheres as units.
- Publication:
-
Journal of Chemical Physics
- Pub Date:
- October 1935
- DOI:
- 10.1063/1.1749566
- Bibcode:
- 1935JChPh...3..631C