Look up the lattice energies in Table 6.3, and calculate the energy change in kilojoules per mole for the formation of the following substances from their elements. (a) LiF( s ) (The sublimation energy for Li( s ) is +159.4 kJ/mol, the E i for Li( g ) is 520 kJ/mol, the E ea for F( g ) is − 328 kJ/mol , and the bond dissociation energy of F 2 ( g ) is + 158 kJ/mol .] (b) CaF 2 ( s ) [The sublimation energy for Ca( s ) is + 178.2 kJ/mol, E i1 = + 589 . 8 kJ/mol , and E i2 = + 1145 kJ/mol .]
Look up the lattice energies in Table 6.3, and calculate the energy change in kilojoules per mole for the formation of the following substances from their elements. (a) LiF( s ) (The sublimation energy for Li( s ) is +159.4 kJ/mol, the E i for Li( g ) is 520 kJ/mol, the E ea for F( g ) is − 328 kJ/mol , and the bond dissociation energy of F 2 ( g ) is + 158 kJ/mol .] (b) CaF 2 ( s ) [The sublimation energy for Ca( s ) is + 178.2 kJ/mol, E i1 = + 589 . 8 kJ/mol , and E i2 = + 1145 kJ/mol .]
Solution Summary: The author explains the Born-Haber cycle of ionic solids from its constituent elements.
Look up the lattice energies in Table 6.3, and calculate the energy change in kilojoules per mole for the formation of the following substances from their elements. (a) LiF(s) (The sublimation energy for Li(s) is +159.4 kJ/mol, the
E
i
for Li(g) is 520 kJ/mol, the
E
ea
for F(g) is
−
328 kJ/mol
, and the bond dissociation energy of
F
2
(
g
)
is
+
158 kJ/mol
.] (b) CaF2(s) [The sublimation energy for Ca(s) is + 178.2 kJ/mol,
E
i1
=
+
589
.
8 kJ/mol
, and
E
i2
=
+
1145 kJ/mol
.]
Formula Formula Bond dissociation energy (BDE) is the energy required to break a bond, making it an endothermic process. BDE is calculated for a particular bond and therefore consists of fragments such as radicals since it undergoes homolytic bond cleavage. For the homolysis of a X-Y molecule, the energy of bond dissociation is calculated as the difference in the total enthalpy of formation for the reactants and products. X-Y → X + Y BDE = Δ H f X + Δ H f Y – Δ H f X-Y where, ΔHf is the heat of formation.
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