Chapter 16, Problem 37QAP

Phosgene, COCl₂, can be formed by the reaction of chloroform, CHCl₃(l), with oxygen:

$2{\text{CHCl}}_3\left(l\right)+{\text{O}}_2\left(g\right)\to 2{\text{COCl}}_2\left(g\right)+2\text{HCl}\left(g\right)$

$\Delta H°=-353.2\text{kJ};\Delta G°=-452.4\text{kJ}$ at 25°C

(a) Calculate ΔS° for the reaction. Is the sign reasonable?

(b) Calculate S° for phosgene.

(c) Calculate $\Delta H_{\text{f}}^{°}$ for phosgene.