8.83 Construct a Born-Haber cycle for the formation of the hy- pothetical compound NaCl2, where the sodium ion has a 2+ charge (the second ionization energy for sodium is given in Table 7.2). (a) How large would the lattice energy need to be for the formation of NaCl2 to be exothermic? (b) If we were to estimate the lattice energy of NaCl2 to be roughly equal to that of MgCl2 (2326 kJ/mol from Table 8.1), what value would you obtain for the standard enthalpy of formation, AH, of NaCl2? ing together of Na (g) and Cl (AH=-788 kJ/mol). Notice Table 8.1 lists the lattice energies for a number of ionic compounds. The large itive values indicate that the ions are strongly attracted to one another in ionic solid Pos TABLE 8.1 Lattice Energies for Some Ionic Compounds Lattice Energy (kJ/mol) Lattice Energy (kJ/mo Compound 2526 Compound MgCl2 1030 2127 LiF SrCl2 834 LiCl 730 Lil 3795 MgO 910 NaF 3414 CaO 788 NaCl 3217 SrO 732 NaBr 682 Nal ScN 7547 KF 808 КС. 701 KBr 671 CsCl 657 CsI 600

8.83 Construct a Born-Haber cycle for the formation of the hy- pothetical compound NaCl2, where the sodium ion has a 2+ charge (the second ionization energy for sodium is given in Table 7.2). (a) How large would the lattice energy need to be for the formation of NaCl2 to be exothermic? (b) If we were to estimate the lattice energy of NaCl2 to be roughly equal to that of MgCl2 (2326 kJ/mol from Table 8.1), what value would you obtain for the standard enthalpy of formation, AH, of NaCl2? ing together of Na (g) and Cl (AH=-788 kJ/mol). Notice Table 8.1 lists the lattice energies for a number of ionic compounds. The large itive values indicate that the ions are strongly attracted to one another in ionic solid Pos TABLE 8.1 Lattice Energies for Some Ionic Compounds Lattice Energy (kJ/mol) Lattice Energy (kJ/mo Compound 2526 Compound MgCl2 1030 2127 LiF SrCl2 834 LiCl 730 Lil 3795 MgO 910 NaF 3414 CaO 788 NaCl 3217 SrO 732 NaBr 682 Nal ScN 7547 KF 808 КС. 701 KBr 671 CsCl 657 CsI 600

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Which of the following ionic compounds has the largest lattice energy? Select an answer and submit. Forkeyboard navigation, use the up/down arrow keys to select an answer. a CaCl, b. CaO LiBr LICI e LiF
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BS *** QUESTION 24 Of the solids below the order of increasing lattice energy is OA.NaCl
Which one of the following trends appears when considering lattice energies? Anion A) The higher the charge on the ions, the higher the lattice energy. Cation F- CI- Br- |- O2- B) The more ions present in an ionic compound, the smaller the lattice energy. Lit 1036 853 807 757 2925 Na+ 923 787 747 704 2695 C) The larger the distance between ions in the ionic compound, the higher the lattice energy. K+ 821 715 682 649 2360 Mg2+ 2957 2524 2440 2327 3791 D) In general, alkali metals have larger lattice energies than alkaline earth metals with the same anions. Ca2+ 2630 2258 2176 2074 3401 Al3+ 5215 5492 5361 5217 15,916
The charges and sizes of the ions in an ionic compound affect the strength of the electrostatic interaction between the ions and thus the strength of the lattice energy of the ionic compound. Arrange the compounds according to the magnitudes of their lattice energies based on the relative ion charges and sizes. (highest to lowest) Mgo,NaF,MgF2, and KCI
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9. Use the following data to calculate the lattice energy of Cao. The enthalpy of formation of Cao is –636 kj/mol. The enthalpy of sublimation of Ca is +192 kj/mol, the first ionization energy of Ca is +590 kj/mol, and the second ionization energy of Ca is +1145 kj/mol. The enthalpy of dissociation of 02 is +494 kj/mol of 02 molecules, the first electron affinity of O is -141 kj/mol of 0 atoms, and the second electron affinity of 0 is +845 kj/mol of 0¯ ions.
Which of the following is true when the bond energy of the products is at lower energy than the bond energy of the reactants? Energy is released, exothermic reaction Energy is released, endothermic reaction O Energy is absorbed, exothermic reaction O Energy is absorbed, endothermic reaction Energy is neither released or absorbed
Match the following substances with their correct lattice energies (kJ/mole): 608, 1030, 2027, 3795, 5278, 7492 [write the numbers under the formulas] CsBr BaCl2 MgO GaN Ca3P2 KCl
Assuming that all of the ionic crystals have the same crystal structure, predict which of these will have the largest (most negative) lattice energy. BaCl2 CaBr2 MgF2 BaBr2 CaF2
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