Answer:
4 NH₃ + 3 O₂ -----> 2 N₂ + 6 H₂O
Step-by-step explanation:
An equation is balanced when there is an equal amount of each element on both sides of a reaction. To balance the elements, you can add coefficients to modify the amount of elements/molecules present. It is important to have the smallest coefficients possible.
The unbalanced equation:
NH₃ + O₂ -----> N₂ + H₂O
Reactants: 1 nitrogen, 3 hydrogen, 2 oxygen
Products: 2 nitrogen, 2 hydrogen, 1 oxygen
The balanced equation:
4 NH₃ + 3 O₂ -----> 2 N₂ + 6 H₂O
Reactants: 4 nitrogen, 12 hydrogen, 6 oxygen
Products: 4 nitrogen, 12 hydrogen, 6 oxygen