Chemistry Practice Problems Born Haber Cycle Practice Problems Solution: Use the data given below to construct a Born-Haber...

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Solution: Use the data given below to construct a Born-Haber cycle to determine the lattice energy of KBr.       ΔH°(kJ) K(s) → K(g)                                             89 K(g) → K+(g) + e-                                   419 ½ Br2(l) → Br(g)                                      96 Br(g) + e- → Br-(g)                                 -325 K(s) + ½ Br2(g) → KBr(s)                       -394   A) -885 kJ B) -673 kJ C) +367 kJ D) -464 kJ E) +246 kJ

Problem

Use the data given below to construct a Born-Haber cycle to determine the lattice energy of KBr.

      ΔH°(kJ)

K(s) → K(g)                                             89

K(g) → K+(g) + e-                                   419

½ Br2(l) → Br(g)                                      96

Br(g) + e- → Br-(g)                                 -325

K(s) + ½ Br2(g) → KBr(s)                       -394

 

A) -885 kJ

B) -673 kJ

C) +367 kJ

D) -464 kJ

E) +246 kJ