What is the heat of formation of water in kcal mol?

Apr 14, 2018

Unknown without data....

Explanation:

${H}_{2} \left(g\right) + \frac{1}{2} {O}_{2} \left(g\right) \rightarrow {H}_{2} O \left(l\right) + \Delta {H}^{\circ}$
DeltaH_"rxn"^@=DeltaH_f^@("water")=-285.5*kJ*mol^-1...and when we write $\Delta {H}_{\text{rxn}}^{\circ}$ we mean per moles of reaction as written....were we to double the given equation...to give...
$2 {H}_{2} \left(g\right) + {O}_{2} \left(g\right) \rightarrow 2 {H}_{2} O \left(l\right) + \Delta {H}^{\circ}$
Delta_"rxn"^@=2xx-285.5*kJ*mol^-1=??