# What is the molar heat of formation of water?

${H}_{2} \left(g\right) + \frac{1}{2} {O}_{2} \left(g\right) \rightarrow {H}_{2} O \left(l\right) + {\Delta}_{\text{enthalpy of formation}}$
$\Delta {H}_{f}^{\circ} \left({H}_{2} O\right) \equiv - 285.6 \cdot k J \cdot m o {l}^{-} 1$...