Short Answer TypeWhat are important consequences of lattice enthalpies?
Important consequences of lattice enthalpies:
(i) The greater the lattice enthalpy, more stable is the ionic compound.
(ii) The lattice enthalpy is greater, for ions of higher charge, and smaller radii.
(iii) The lattice enthalpies effect the solubilities of ionic compounds.
Long Answer TypeHow can the lattice enthalpy of an ionic NaCl be determined by using Born-Haber cycle?
Calculate the lattice enthalpy of KCl crystal from the following data:
Sublimation enthalpy of pottasium (K) = +89 kJ mol-1
Dissociation enthalpy of 
= +122 kJ mol-1
Ionisation enthalpy of K(g) +425 kJ mol-1
Electron gain enthalpy of Cl(g) = -355 kJ mol-1
Enthalpy of formation of 
Calculate the lattice enthalpy of LiF, given that the enthalpy of
(i) sublimation of lithium is 155.2 kJ mol–1
(ii) dissociation of 1/2 mol of F2is 75.3 kJ
(iii) ionization of lithium is 520 kJ mol–1
(iv) electron gain of 1 mol of F(g) is –333 kJ
(v) ∆f H0 ∆fH0 overall is –795 kJ mol–1
Short Answer TypeCalculate the lattice enthalpy of MgBr2 from the given data. The enthalpy of formation of MgBr2 according to the reaction
Long Answer TypeThe tendency of a system to acquire a state of maximum randomness is the sole criterion for the spontaneity of a process. Comment.
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