Question 9.2: Arrange these ionic compounds in order of increasing magnitu...

Principles of Chemistry: A Molecular Approach

Arrange these ionic compounds in order of increasing magnitude of lattice energy: CaO, KBr, KCl, SrO.

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KBr and KCl have lattice energies of smaller magnitude than CaO and SrO because of their lower ionic charges (1+,1- compared to 2+, 2-). Between KBr and KCl, KBr has a lattice energy of lower magnitude due to the larger ionic radius of the bromide ion relative to the chloride ion. Between CaO and SrO, the magnitude of the lattice energy of SrO is lower due to the larger ionic radius of the strontium ion relative to the calcium ion.

Order of increasing magnitude of lattice energy:
KBr < KCl < SrO < CaO
Actual lattice energy values:

Compound	Lattice energy (kJ/mol)
KBr	-671
KCl	-701
SrO	-3217
CaO	-3414

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