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Chemistry & Chemical Reactivity

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

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BuyFindarrow_forward

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)

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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,

ΔHof(CaCl2)=ΔH at(Ca)+ΔH at(Cl)+ΔHIE1+ΔHIE2+2ΔHEA(Cl)+ΔHlattice(CaCl2)ΔHof(CaCl2)=-795.8 kJ/molΔH at(Ca)=+178.2 kJ/molΔHIE1=+590 kJ/molΔHIE2=+1145 kJ/molΔHEA(Cl)=-349 kJ/moltherefore,substitutingthese <

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