The enthalpies of formation of iodoethane, 1,2-diiodoethane, 1,3-diiodopropane, and 1,4-diiodobutane

✍ Scribed by A.S. Carson; P.G. Laye; J.B. Pedley; Alison M. Welsby; J.S. Chickos; Sarah Hosseini

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 202 KB
• Volume: 26
• Category: Article
• ISSN: 0021-9614
• DOI: 10.1006/jcht.1994.1128

✦ Synopsis

The standard molar enthalpies of formation at the temperature (298.15 \mathrm{~K}) of iodoethane, 1,2-diiodoethane, 1,3-diiodopropane, and 1,4-diiodobutane have been measured by rotating combustion calorimetry. The following results were obtained: (\Delta_{\mathrm{f}} H_{\mathrm{m}}^{\circ}\left(\mathrm{C}{2} \mathrm{H}{5} \mathrm{I}, 1\right)=) (-(39.1 \pm 0.8) \mathrm{kJ} \cdot \mathrm{mol}^{-1} ; \quad \Delta_{\mathrm{f}} H_{\mathrm{m}}^{\circ}\left(\mathrm{C}{2} \mathrm{H}{4} \mathrm{I}{2}, \mathrm{cr}\right)=(9.3 \pm 0.8) \mathrm{kJ} \cdot \mathrm{mol}^{-1} ; \quad \Delta{\mathrm{f}} H_{\mathrm{m}}^{o}\left(\mathrm{C}{3} \mathbf{H}{6} \mathbf{I}{2}, 1\right)=) (-(8.9 \pm 1.4) \mathrm{kJ} \cdot \mathrm{mol}^{-1} ; \Delta{\mathrm{f}} H_{\mathrm{m}}^{\mathrm{o}}\left(\mathrm{C}{4} \mathbf{H}{8} \mathrm{I}_{2}, 1\right)=-(30.0 \pm 2.0) \mathrm{kJ} \cdot \mathrm{mol}^{-1}). The results have been combined with the molar enthalpies of vaporization and sublimation to give the values for the gas phase.