Born-Haber dataa
for alkali halides, in kJ/mole
|
|
Li |
Na |
K |
Rb |
Cs |
|
|
|
DHa,m = 161 |
107.7 |
89.1 |
85.8 |
76.6 |
|
|
|
DHion = 520.1 |
495.8 |
418.8 |
403.0 |
375.7 |
|
|
F |
DHea = 327.9 |
DHf = -616.9 |
-569.0 |
-562.6 |
-549.3 |
-530.9 |
|
|
DHa,n = 78.5 |
DHxtal = -1,049 |
-923.1 |
-821.1 |
-788.7 |
-733.8 |
|
Cl |
DHea = 348.6 |
DHf = -408.8 |
-411.0 |
-435.9 |
-430.5 |
-433.0 |
|
|
DHa,n = 121.3 |
DHxtal = -863 |
-787.2 |
-716.5 |
-692.0 |
-658.0 |
|
Br |
DHea = 324.4 |
DH f = -350.3 |
-359.9 |
-392.2 |
-389.2 |
-394.6 |
|
|
DHa,n = 11.9 |
DH xtal = -819 |
-750.9 |
-687.6 |
-665.5 |
-634.4 |
|
I |
DHea = 295.3 |
DH f = -297.9 |
-288.0 |
-327.6 |
-328.4 |
-336.8 |
|
|
DHa,n = 106.8 |
DH xtal = -790 |
-703.0 |
-647.0 |
-628.7 |
-600.6 |
aAll values of DHion and DHea are for 0 K, that is, about 6 kJ less than the values at 25°C. These two differences cancel one another in the Born-Haber cycle calculations.