Question

For each pair, indicate which would have the lattice energy of greater magnitude. O Mgs o Сате • Cao O sro o Cao O Cas O CSF ORDF OKI O sro Consider how the relative energies of interaction of "point" charges would vary with respect to the expected interionic distances, according to Coulomb's Law. (Detailed calculations should NOT be required to make these comparisons -- but consider, for example, the relative effects of doubling the charges, as compared to increasing the interionic distances.)

Answer 1

lattice energy of MgS   = 3406KJ/mole

lattice energy of CaTe     = -2721KJ/mole

MgS has greater lattice energy than CaTe

lattice energy of MgO = 3795KJ/mole

lattice energy of SnO     = -3652KJ/mole

SnO has greater lattice energy MgO

ionic radius of Mg^2+<Sn^2+

lattice energy of CaO = -3464KJ/mole

lattice energy of CaS     = -3093KJ/mole

CaO has greater lattice energy CaS

ionic radius of S^2-<O^2-

lattice energy of CsF = -744KJ/mole

lattice energy of RbF    = -774KJ/mole

RbF has greater lattice energy CsF

ionic radius of Rb^+<Cs^+

lattice energy of KI = -632KJ/mole

lattice energy of SrO    = -3217KJ/mole

SrO has greater lattice energy KI

ionic radius of Sr^2+<K^+