Question

3. Consider the dissolution of NaBr and NaI. The values provided here will be helpful for answering the following questions.

ΔH∘soln (kJ/mol) ΔS∘soln Jmol•K​

NaBr –0.860 57.0

NaI –7.50 74.0

a.Write a balanced equilibrium equation for the dissolution of NaI in water. Include phases.

b. Calculate the change in free energy if 1.18 moles of NaI is dissolved in water at 25.0°C.

c. What is the dissolution of 1.00 mol of NaBr at 298.15 K?

Answer 1

a. NaI (s) + H₂O (l) = Na⁺(aq) + I^- (aq)

b. -29.6 kJ

с. non spontaneous