Question
What is difference between molecules and compounds? Give examples of each.
Molecules may be made up of same kind of atoms in case of element, e.g. O2, N2
Molecule of compound is made up of two or more kind of atoms e.g. H2O, CO2, NH3
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| Elements | $\Delta\text{H}_{1}$ | $\Delta{\text{H}}_{2}$ | $\Delta_{\text{eg}}\text{H}$ |
| I | 520 | 7300 | -60 |
| II | 419 | 3051 | -48 |
| III | 1681 | 3374 | -328 |
| IV | 1008 | 1846 | -295 |
| V | 2372 | 5251 | +48 |
| VI | 738 | 1451 | -40 |
| Bond | Bond enthalpy (kJ mol-1) |
| C-H | 414 |
| O=O | 499 |
| C=O | 724 |
| O-H | 460 |
| C=C | 619 |