You haven't provided a reaction involving NH₃ and H₂O. Please provide the balanced chemical equation for the reaction you're interested in.

Once you provide the equation, I can help you identify the stoichiometric factors needed to convert between moles of NH₃ and moles of H₂O.

For example, if the reaction is:

2 NH₃ + 3 O₂ → N₂ + 3 H₂O

The stoichiometric factor between NH₃ and H₂O is 2:3. This means that for every 2 moles of NH₃ reacted, 3 moles of H₂O are produced.