Even though so much energy is required to form a metal cation with a 21 charge, the
Chapter 9, Problem 9.75(choose chapter or problem)
Even though so much energy is required to form a metal cation with a 21 charge, the alkaline earth metals form halides with general formula MX2, rather than MX. (a) Use the following data to calculate DH8 f of MgCl: Mg(s) Mg(g) DH8 5 148 kJ Cl2(g) 2Cl(g) DH8 5 243 kJ Mg(g) Mg1(g) 1 e2 DH8 5 738 kJ Cl(g) 1 e2 Cl2(g) DH8 5 2349 kJ DH8 lattice of MgCl 5 783.5 kJ/mol (b) Is MgCl favored energetically relative to Mg and Cl2? Explain. (c) Use Hesss law to calculate DH8 for the conversion of MgCl to MgCl2 and Mg (DH8 f of MgCl2 5 2641.6 kJ/mol). (d) Is MgCl favored energetically relative to MgCl2? Explain.
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