Question

calculate the lattice enthalpy of potassium fluoride from the following data:
enthalpy of formation of K(g):
+89 kJ · mol−1
first ionization energy of K(g):
+418 kJ · mol−1
enthalpy of formation of F(g):
+79 kJ · mol−1
electron affinity of F(g):
+328 (
H = −328) kJ · mol−1
enthalpy of formation of KF(s):
−567 kJ · mol−1

Options:

1. 1481 kJ · mol−1
2. 904 kJ · mol−1
3. 497 kJ · mol−1
4. 347 kJ · mol−1
5. 825 kJ · mol−1

Answer 1

You want to use the Born-Haber cycle.

Answer 2

5. 825

Answer 3

The answer is 5) 825 kJ · mol−1

Answer 4

Solution of the question