Bromine monofluoride (BF) disproportionates to bromine gas and bromine tri- and pentafluorides. Use the following to find Δ${{\mathbf{H}}^{\mathbf{o}}}_{\mathbf{rxn}}$for the decomposition of BrF to its elements:

$$\begin{gathered} \mathbf{3}{\mathbf{BrF}}_{\left(g\right)}\mathbf{\to }\mathbf{B}{{\mathbf{r}}_{\mathbf{2}}}_{\left(g\right)}\mathbf{+}{\mathbf{BrF}}_{{\mathbf{3}}_{\left(l\right)}}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{\Delta }{{\mathbf{H}}^{\mathbf{o}}}_{\mathbf{rxn}}\mathbf{=}\mathbf{-}\mathbf{125}\mathbf{.}\mathbf{3}\mathbf{KJ}\mathbf{\backslash }\mathbf{hfill} \\ \mathbf{5}{\mathbf{BrF}}_{\left(g\right)}\mathbf{\to }\mathbf{2}\mathbf{B}{{\mathbf{r}}_{\mathbf{2}}}_{\left(g\right)}\mathbf{+}{\mathbf{BrF}}_{{\mathbf{5}}_{\left(l\right)}}\mathbf{}\mathbf{}\mathbf{}\mathbf{\Delta }{{\mathbf{H}}^{\mathbf{o}}}_{\mathbf{rxn}}\mathbf{=}\mathbf{-}\mathbf{166}\mathbf{.}\mathbf{1}\mathbf{KJ}\mathbf{\backslash }\mathbf{hfill} \\ {\mathbf{BrF}}_{{\mathbf{3}}_{\left(l\right)}}\mathbf{+}{\mathbf{F}}_{\mathbf{2}}\mathbf{\to }\left(g\right){\mathbf{BrF}}_{{\mathbf{5}}_{\left(l\right)}}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{\Delta }{{\mathbf{H}}^{\mathbf{o}}}_{\mathbf{rxn}}\mathbf{=}\mathbf{-}\mathbf{158}\mathbf{.}\mathbf{0}\mathbf{KJ}\mathbf{\backslash }\mathbf{hfill} \end{gathered}$$

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