# How would you calculate DeltaH^@ for the following reaction: Br_2(g) -> Br_2(l)?

$\Delta {H}_{f}^{\circ} , B {r}_{2} \left(l\right)$ is defined as $0 \cdot k J \cdot m o {l}^{-} 1$. Data exist somewhere for calculation of $\Delta {H}_{f}^{\circ} , B {r}_{2} \left(g\right)$.