Question

what is lattice enthalpy​

Answer 1

The lattice energy is the energy required to break one mole of an ionic compound to its constitent ions in gaseous state. It is a measure of the cohesive forces that bind ions. Lattice energy is relevant to many practical properties including solubility, hardness, and volatility. The lattice energy is usually deduced from the Born–Haber cycle.[1]

Compound Experimental Lattice Energy[1] Structure type Comment

LiF −1030 kJ/mol NaCl difference vs. sodium chloride due to greater charge/radius for both cation and anion

NaCl −786 kJ/mol NaCl reference compound for NaCl lattice

NaBr −747 kJ/mol NaCl weaker lattice vs. NaCl

NaI −704 kJ/mol NaCl weaker lattice vs. NaBr, soluble in acetone

CsCl −657 kJ/mol CsCl reference compound for CsCl lattice

CsBr −632 kJ/mol CsCl trend vs CsCl like NaCl vs. NaBr

CsI −600 kJ/mol CsCl trend vs CsCl like NaCl vs. NaI

MgO −3795 kJ/mol NaCl M2+O2- materials have high lattice energies vs. M+O−. MgO is insoluble in all solvents

CaO −3414 kJ/mol NaCl M2+O2- materials have high lattice energies vs. M+O−. CaO is insoluble in all solvents

SrO −3217 kJ/mol NaCl M2+O2- materials have high lattice energies vs. M+O−. SrO is insoluble in all solvents

MgF2 −2922 kJ/mol rutile contrast with Mg2+O2-

TiO2 −12150 kJ/mol rutile TiO2 (rutile) and some other M4+(O2-)2 compounds are refractory materials

Answer 2

$\huge{\fbox{\fbox{\red{Required Answer}}}}$

The change in enthalpy associated with the formation of one mole of an ionic compound from its gaseous state and standard conditions.

Lattice of a compound; the enthalpy change which occur when one mole of an ionic compound dissociates into its gaseous ionic state.

Explanation:

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