Pick the compound with the biggest lattice energy: 1) LiI or CsI 2) SrS or SrCl2

Pick the compound with the biggest lattice energy:

1) LiI or CsI

2) SrS or SrCl2

Solutions

Expert Solution

Lattice energy is defined as the energy required to separate a mole of an ionic solid into gaseous ions.

Two main factors that contribute to the magnitude of the lattice energy are the charge and radius of the bonded ions. Lattice Energy is directly proportional to charge on cation/anion and inversely proportional to bond length (center-to-center distance of cation and anion atoms) or radius of atoms.

For example :

1) same charge and different radius or size of cation

LiCl > NaCl > KCl > RbCl > CsCl

NaF > NaCl > NaBr > NaI

MgO > CaO > SrO

2) Charge is more dominating factor than size for lattice energies

MgO > NaF

Mg = +2 , O = -2

Na = +1 , F = -1

Answer for 1) LiI is having larger lattice energy than CsI

Answer for 2) SrS is having larger lattice energy than SrCl2

queen_honey_blossom answered 1 year ago

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