Figure 1 shows the reaction of methane, CH4\text{CH}_4CH4, with chlorine gas, Cl2\text{Cl}_2Cl2, to produce chloromethane and hydrogen chloride.
Figure 1
Figure 2 shows the bond energies for various covalent bonds.
| Bond | Bond energy in kJ mol−1\text{kJ\ mol}^{-1}kJ mol−1 |
|---|---|
| C−H\text{C}-\text{H}C−H | 413 |
| Cl−Cl\text{Cl}-\text{Cl}Cl−Cl | 243 |
| C−Cl\text{C}-\text{Cl}C−Cl | 339 |
| H−Cl\text{H}-\text{Cl}H−Cl | 432 |
Figure 2
Use the bond energies in Figure 2 to calculate the overall energy change of the reaction shown in Figure 1.
