# ap chem

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

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1. You might like some of the following links:

http://search.yahoo.com/search?fr=mcafee&p=how+to+calculate+lattice+enthalpy

Sra

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2. You want to use the Born-Haber cycle.

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3. 5. 825

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4. The answer is 5) 825 kJ · mol−1

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5. Solution of the question

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