# How do you write the equation that represents the formation of HF(g)?

$\frac{1}{2} {H}_{2} \left(g\right) + \frac{1}{2} {F}_{2} \left(g\right) \rightarrow H F \left(g\right)$ ;DeltaH_"rxn"=DeltaH_f^@
Given this definition, $\Delta {H}_{f}^{\circ}$ $H F$ is the enthalpy associated with the following reaction:
$\frac{1}{2} {H}_{2} \left(g\right) + \frac{1}{2} {F}_{2} \left(g\right) \rightarrow H F \left(g\right)$ ;DeltaH_"rxn"=DeltaH_f^@