Make a plot of bonding energy versus melting temperature for the metals listed in Table 2.3.
Using this plot, approximate the bonding energy for molybdenum, which has a melting temperature of 2617°C.
Table 2.3 Bonding Energies and Melting Temperatures for Various Substances
Substance | Bonding Energy (kJ/mol) | Melting Temperature (°C) |
| Ionic |
|
NaCl | 640 | 801 |
LiF | 850 | 848 |
MgO | 1000 | 2800 |
CaF2 | 1548 | 1418 |
| Covalent |
|
Cl2 | 121 | -102 |
Si | 450 | 1410 |
InSb | 523 | 942 |
C (diamond) | 713 | >3550 |
SiC | 1230 | 2830 |
| Metallic |
|
Hg | 62 | -39 |
Al | 330 | 660 |
Ag | 285 | 962 |
W | 850 | 3414 |
| van der Waalsa |
|
Ar | 7.7 | -189(@ 69 kPa) |
Kr 11.7 | -158 (@ 73.2 kPa) |
|
CH4 | 18 | -182 |
Cl2 | 31 | -101 |
| Hydrogena |
|
HF | 29 | -83 |
NH3 | 35 | -78 |
H2O | 51 | 0 |
aValues for van der Waals and hydrogen bonds are energies between molecules or atoms (intermolecular), not between atoms within a molecule (intramolecular).
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