lattice energy -2957 kJ/mol first ionization energy of Mg 735 kJ/mol second ioni

Question

lattice energy -2957 kJ/mol first ionization energy of Mg 735 kJ/mol second ionization energy of Mg 1445 kJ/mol electron affinity of F -328 kJ/mol bond energy of F2 154 kJ/mol enthalpy of sublimation of Mg 150. kJ/mol

Explanation / Answer

1a. Ga: 3+     O: 2-   ->   Ga2O3    -> Galliumoxide b. Ba: 2+     S:2-     ->  BaS         -> Bariumsulfide c. Sr: 2+        F:1-     ->  SrF2        -> Strontium fluoride d. Al: 3+      Cl-        ->  AlCl3       -> Aluminumchloride 2. Break up the individual steps to get the overall reaction Mg(s) ->Mg(g)                         150 KJ F2 ->2F                                     154 KJ Mg -> Mg+ +e-                        735 KJ Mg+ -> Mg2+ +e-                    1445 KJ 2F + 2e- ->2F-                         2(-328) KJ Mg2+ + 2F- ->MgF2               -2957 KJ Overall: Mg + F2 ->MgF2        -1129 KJ

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