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
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