Answer : The number of moles of water produced are, 1.5 moles
Explanation : Given,
Moles of
= 1 mole
The given balanced chemical reaction is,

By the stoichiometry we can say that, 4 moles of ammonia gas react with 5 moles of oxygen gas to produce 4 moles of nitric oxide and 6 moles of water as a product.
As, 4 moles of ammonia react to give 6 moles of water
So, 1 moles of ammonia react to give
moles of water
Therefore, the number of moles of water produced are, 1.5 moles