Answer:
The balanced chemical equation is:
![4NH_3+5O_2\operatorname{\rightarrow}4NO+6H_2O.]()
Step-by-step explanation:
First, let's write the equation:
You can realize that is unbalanced for hydrogen (H) and oxygen (O). If we put '2' moles beside NH3 and '3' moles beside H2O, we're going to have 6 hydrogens for both sides:
![2NH_3+O_2\operatorname{\rightarrow}NO+3H_2O]()
Nitrogen is unbalanced, so if we put '2' moles beside NO, we obtain:
![2NH_3+O_2\operatorname{\rightarrow}2NO+3H_2O]()
But you can see that oxygen is still unbalanced because on the left side we have 2 oxygens and on the right side we have 5 oxygens. We just can use integers, so we cannot put a number beside O2 to have 5 oxygens. If we multiply all the integers in the equation by two, we're going to have:
![4NH_3+O_2\operatorname{\rightarrow}4NO+6H_2O]()
We have nitrogen (N) and hydrogen (H) balanced. On the right side we have 10 oxygens, so on the left side we can put '5' moles beside O2 and the chemical equation will be balanced:
![4NH_3+5O_2\operatorname{\rightarrow}4NO+6H_2O.]()