Chapter 12, Problem 64IL

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Chapter
Section

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

# Calculate the lattice energy of CaCl2 using a Born-Haber cycle and data from Appendices F and L and Table 7.5.TABLE 7.5 First, Second, and Third Ionization Energies for the Main Group Elements in Periods 2–4 (kJ/mol)

Interpretation Introduction

Interpretation:

The lattice energy of calcium chloride using Born-Haber cycle has to be calculated.

Concept introduction:

The lattice energy is calculated by using following method,

ΔHof(CaCl2)=ΔH at(Ca)+ΔH at(Cl)+ΔHIE1+ΔHIE2+2ΔHEA(Cl)+ΔHlattice(CaCl2)

Explanation

The molar enthalpy formation is calculated by using Hess law, the enthalpy of the formation is given below,

Î”Hof(CaCl2)â€‰=â€‰Î”HÂ at(Ca)â€‰+â€‰Î”HÂ at(Cl)+â€‰Î”HIE1+â€‰Î”HIE2+2Î”HEA(Cl)+â€‰Î”Hâ€‰lattice(CaCl2)Î”Hof(CaCl2)=â€‰-795.8Â kJ/molÎ”HÂ at(Ca)â€‰=â€‰+178.2Â kJ/molâ€‰Î”HIE1â€‰=â€‰+590Â kJ/molÎ”HIE2â€‰â€‰=â€‰+1145Â kJ/molÎ”HEA(Cl)â€‰=â€‰-349Â kJ/moltherefore,substitutingâ€‰theseâ€‰<

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