Question

Trouton’s rule states that for many liquids at their normal boiling points, the standard molar entropy of vaporization is about 88 J/mol-K. (a) Estimate the normal boiling point of bromine, Br₂, by determining ∆H°_vap for Br₂ using data from Appendix C. Assume that ∆H°_vap remains constant with temperature and that Trouton’s rule holds. (b) Look up the normal boiling point of Br₂ in a chemistry handbook or at the WebElements Web site (www.webelements. com) and compare it to your calculation. What are the possible sources of error, or incorrect assumptions, in the calculation?