Chapter 9, Problem 64E

Given the following data:

$\text{2ClF}\left(\text{g}\right){\text{ + O}}_{\text{2}}\left(\text{g}\right)\to {\text{ Cl}}_{\text{2}}\text{O}\left(\text{g}\right){\text{ + F}}_{\text{2}}\text{O}\left(\text{g}\right)\text{ΔH = 167}\text{.4 kJ}$

${\text{2ClF}}_{\text{3}}\left(\text{g}\right){\text{ + 2O}}_{\text{2}}\left(\text{g}\right)\to {\text{ Cl}}_{\text{2}}\text{O}\left(\text{g}\right){\text{ + 3F}}_{\text{2}}\text{O}\left(\text{g}\right)\text{ΔH = 341}\text{.4 kJ}$

${\text{2F}}_2\left(\text{g}\right){\text{ + O}}_{\text{2}}\left(\text{g}\right)\to {\text{ 2F}}_{\text{2}}\text{O}\left(\text{g}\right)\text{ΔH = -}\text{43}\text{.4 kJ}$

calculate $\text{ΔH}$ for the reaction

$\text{ClF(g)}\text{}\text{+}{\text{F}}_{\text{2}}\left(\text{g}\right)\to {\text{ ClF}}_{\text{3}}\left(\text{g}\right)$