Chapter 9, Problem 9.151MP

Phosgene, $COC{I}_2\left(g\right),$ is a toxic gas used as an agent of war-fare in World War I.
(a) Draw an electron-dot structure for phosgene.
(b) Using the table of bond dissociation energies (Table 9.3)and the value $\Delta H{°}_{\text{f}}=716.7$ kJ/mol for C(g), estimate $\Delta H{°}_{\text{f}}$ for $COC{I}_2\left(g\right)$ at 25 °C. Compare your answer to the actual $\Delta H{°}_{\text{f}}$ given in Appendix B, and explain why your calculation is only an estimate.