conversion of MgCl to MgCl2 and Mg:
2 MgCl → MgCl2 + Mg
MgCl + ½ Cl2 → MgCl2 ΔH° = -641.6 kJ/mol
Mg + ½ Cl2→ MgCl ΔH° = -125 kJ/mol
Even though so much energy is required to form a metal cation with a 2+ charge, the alkaline earth metals form halides with the general formula MX2, rather than MX.
(c) Use Hess’s law to calculate ΔH° for the conversion of MgCl to MgCl2 and Mg (ΔH° f of MgCl2 = −641.6 kJ/mol).
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