Topical Questions These questions are keyed to major topics in the chapter. Usually a q...

Topical Questions

These questions are keyed to major topics in the chapter. Usually a question that is answered at the back of this book is paired with a similar one that is not.

The standard molar entropy of iodine vapor, I₂(g), is 260.7 J K^-1 mol^-1 and the standard molar enthalpy of formation is 62.4 kJ/mol.

(a) Calculate the entropy change for vaporization of 1 mol of solid iodine (use data from Table 18.1 or Appendix J).

(b) Calculate the enthalpy change for sublimation of iodine.

(c) Assuming that ΔS° does not change with temperature, estimate the temperature at which iodine would sublime (change directly from solid to gas).

Table 18.1