In the Born-Haber cycle for Mg(s) + Cl 2(g) → MgCl 2(s), which step(s) is (are) exothermic for the formation of crystalline solid? (the following may not be balanced equations, but describe reaction processes.)
(1) Mg(g) + 2Cl(g) → Mg 2+(g) + 2Cl(g)
(2) Mg2+(g) + 2Cl(g) → Mg2+(g) + 2Cl - (g)
(3) Mg(s) + Cl2(g) → Mg(g) + Cl 2(g)
(4) Mg(s) + Cl2(g) → Mg(g) + 2Cl(g)
(5) Mg2+(g) + 2Cl - (g) → MgCl 2(g)
a. (1) and (3)
b. (1), (3), and (4)
d. (2) and (5)
e. (1), (2), and (5)
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