A student wrote a chemical equation as shown.

4NH3 + 5O2 → NO + H2O

What should the student do to balance the equation?

Add a coefficient 7 before NO and a 7 before H2O.

Add a coefficient 5 before NO and a 7 before H2O.

Add a coefficient 4 before NO and a 6 before H2O.

Add a coefficient 6 before NO and a 5 before H2O.

The answer to your question is the third option

Explanation:

Chemical reaction

4NH₃ + 5O₂ ⇒ NO + H₂O

Count the number of elements in the reactants and products

Reactants Elements Products

4 N 1

12 H 2

10 O 2

All the elements are unbalanced

Let's add the following coefficients

4NH₃ + 5O₂ ⇒ 4NO + 6H₂O

Reactants Elements Products

4 N 4

12 H 12

10 O 10

Now the reaction is balanced