Since conductance measurements show two ions per formula unit, all the ammonia ligands are present in the coordination sphere. Hence, the structural formula is $\left[ CoBr _{2}\left( NH _{3}\right)_{4}\right] Cl$
$ {\left[ CoBr _{2}\left( NH _{3}\right)_{4}\right] Cl + AgNO _{3} \rightleftharpoons\left[ CoBr _{2}\left( NH _{3}\right)_{4}\right]+ NO _{3}^{-}+ AgCl }$
${\left[ CoBr _{2}\left( NH _{3}\right)_{4}\right] Cl\rightleftharpoons\left[ CoBr _{2}\left( NH _{3}\right)_{4}\right]+Cl ^{-}}$
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$CO + \frac{1}{2}{O_2} \to C{O_2};\,\Delta H = - 24\,kJ$ The heat of formation of $C{O_2}$ is .....$kJ$