When the equation NH3+O2—> HNO3+H2O is completely balanced using smallest whole numbers, the coefficient of O2 would be...

When the equation is completely balanced using smallest whole numbers, the coefficient of O₂ is 2. The correct option is B. 2

From the question,

We are to determine what the coefficient of O₂ would be when the given equation is completely balanced.

The given equation is

NH₃ + O₂ → HNO₃ + H₂O

Now, we will balance the equation using the smallest whole numbers possible

The completely balanced equation is

NH₃ + 2O₂ → HNO₃ + H₂O

Hence, when the equation is completely balanced using smallest whole numbers, the coefficient of O₂ is 2. The correct option is B. 2

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The answer to your question is letter B. 2

Explanation:

Unbalanced reaction

                  NH₃   +   O₂   ⇒     HNO₃   +   H₂O

            Reactants      Elements     Products

                   1                     N                  1

                   3                    H                  3

                   2                    O                 4

Balanced reaction

                   NH₃   +   2O₂   ⇒     HNO₃   +   H₂O

           Reactants      Elements     Products

                   1                     N                  1

                   3                    H                  3

                   4                    O                 4            

When the reaction is completely balanced the coefficient of O₂ is 2

the answer is d. 74.02