CHM 2046C Sample Exam Answers

Module Eight Part II: Solutions Chapter 14

Part P: Enthalpy of Solution Calculation 4 point

Use the following data to calculate the enthalpy of solution of sodium perchlorate, NaClO₄:

∆Hº_f (s) = -382.9 kJ/mol

∆Hº_f (aq, 1 m) = -369.5 kJ/mol

The solution process of NaClO₄ (s);

NaClO₄ (s) à NaClO₄ (aq, 1 m)

∆Hº_solution = ∑ [∆Hº_f (product) ] - ∑ [∆Hº_f (reactant) ]

∆Hº_solution = ∆Hº_f (aq, 1 m) - ∆Hº_f (s)

∆Hº_solution = (-369.5 kJ/mol) – (-382.9 kJ/mol)

Answer:

∆Hº_solution = 13.4 kJ/mol

See Example 14.3 p668-669

Work Example 14.3 p 669

Similar Problems: Kotz Chapter 14 p693 #13-20