The following data compare the standard enthalpies and free energies of formation of

Chapter 19, Problem 19.105

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The following data compare the standard enthalpies and free energies of formation of some crystalline ionic substances and aqueous solutions of the substances: Substance AgN03(s) AgN03(aq) MgS04(s) MgS04(aq) Integrative Exercises 841 li.HJ (kJ/mol) li.GJ (kJ/mol) -124.4 -33.4 -101.7 -34.2 -1283.7 -1169.6 -1374.8 -1198.4 (a) Write the formation reaction for AgN03(s). Based on this reaction, do you expect the entropy of the system to increase or decrease upon the formation of AgN03(s)? (b) Use li.HJ and li.GJ of AgN03(s) to determine the entropy change upon formation of the substance. Is your answer consistent with your reasoning in part (a)? (c) Is dissolving AgN03 in water an exothermic or endothermic process? What about dissolving MgS04 in water? (d) For both AgN03 and Mg504, use the data to calculate the entropy change when the solid is dissolved in water. (e) Discuss the results from part (d) with reference to material presented in this chapter and in the second "Closer Look" box in Section 13.5.

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