Question

In the reaction _____ H2+N2 --> 2 NH3,

Answer 1

A 3 should be placed in front of the H2 to balance it, since the 2 in front of NH3 says there are 6 H atoms. However on the other side, there are only 2. If we add the 3, 3 x 2 = 6. Then it is balanced.

Answer 2

Explanation:

A balanced equation is defined as the equation which contains same number of atoms on both reactant and product side.

For example, $H_{2} + N_{2} \rightarrow 2NH_{3}$

Number of atoms on reactant side are as follows.

• H = 2

• N = 2

Number of atoms on product side are as follows.

• H = 6

• N = 2

Therefore, balance this equation by multiplying $H_{2}$ by 3 on reactant side.

Hence, the balanced equation is as follows.

           $3H_{2} + N_{2} \rightarrow 2NH_{3}$

Thus, we can conclude that a coefficient 3 should be placed in front of $H_{2}$ to balance the reaction.