# What is the standard enthalpy change of the formation of water?

Dec 30, 2016

This is the enthalpy change associated.........

#### Explanation:

This is the enthalpy change associated with the formation of 1 mole of water from its constituent elements in their standard states under standard conditions, i.e.

${H}_{2} \left(g\right) + \frac{1}{2} {O}_{2} \left(g\right) \rightarrow {H}_{2} O \left(l\right)$

$\Delta {H}_{\text{rxn}}^{\circ} = \Delta {H}_{f}^{\circ} = - 285.8 \cdot k J \cdot m o {l}^{-} 1$

Of course, this value must be measured.