Which pair of compounds is listed in order of increasing (more exothermic) lattice energy? MgO < CsCl LiF < LiI v LiF < MgO CaO < BaCl2 NaCl < KCl Flag this Question

Lattice energy depends on the charge of the constituent ions. In MgO, the charge of cation and anion are +2 and -2 respectively.In LiF, the charge of cation and anion are +1 and -1. Similarly, if the electronegativity of the anion is higher, the higher will be the lattice energy. Also, an ionic compound with smaller cation size will have higher lattice energy.

Here, the correct order is,

LiF > LiI

NaCl > KCl

MgO > CsCl

CaO > BaCl2

LiF < MgO

Hope this helps!

Martebi Martebi · Answer 2 · 2021-11-04T00:39:06+01:00

The pair of compounds in order of increasing (more exothermic) lattice energy is LiF < MgO

Lattice energy is often dependent on two factors which are;

Charge on ion: here, the greater the charge, the higher is the lattice energy.

The size of ion that is the smaller the size of ion greater is the lattice energy.

The lattice energy is simply known as the energy needed to dissociate one mole of an ionic compound so as to form its constituents ions and often i the gaseous state.

Conclusively, Lattice energy does not need to be measured empirically, but it can be calculated using electrostatics or with the use of Born-Haber cycle.

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