Question

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

what coefficient should be placed in front of H2 to balance the reaction?
1.
2.
3.
No coefficient is needed.

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

Step-by-step 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.