Born - Haber Cycle Questions Energy Change In The Formation Of Ionic Compounds Page 3
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49. Calculate the lattice energy for LiF(s) given the following:
sublimation energy for Li(s)
+166 kJ/mol
H
+77 kJ/mol
for F(g)
f
first ionization energy of Li(g)
+520. kJ/mol
–328 kJ/mol
electron affinity of F(g)
–617 kJ/mol
enthalpy of formation of LiF(s)
A) 285 kJ/mol
B) –650. kJ/mol
C) 800. kJ/mol
D) –1052 kJ/mol
E)
none of these
10. The formation of which monatomic ion of sulfur is the most energetically favorable?
–
A) S
2–
B) S
2+
C) S
4+
D) S
6+
E)
S
11. In the Born-Haber Cycle describing energy change in formation of ionic compounds,
how many half reactions are exothermic and how many endothermic. Do not include
heat of formation energy change in this question.
A) 2 exothermic / 3 endothermic
B) 3 exothermic / 2 endothermic
C) 2 exothermic / 2 endothermic
D) 3 exothermic / 3 endothermic
Page 3
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