# Problem: 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) c. (5) d. (2) and (5) e. (1), (2), and (5)

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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)

c. (5)

d. (2) and (5)

e. (1), (2), and (5)