Answer:
The coefficient with water is 6.
Explanation:
Chemical equation:
NH₃ + O₂ → NO + H₂O
Balanced chemical equation:
4NH₃ + 5O₂ → 4NO + 6H₂O
When ammonia and oxygen react nitric oxide and water produced.
Nitric oxide is gas and decompose in air.
The coefficient with water is 6 and equation is correctly balanced.
There are four nitrogen atoms, twelve hydrogen atoms and ten oxygen atoms on both side of equation.
Coefficients with reactant and product:
NH₃ 4
O₂ 5
NO 4
H₂O 6
