when the following chemical reaction is balanced, what number is placed before NH3? N2+3H2&NH3 A)1 B)2 C)3 D)6

Question

when the following chemical reaction is balanced, what number is placed before NH3? N2+3H2&NH3    A)1 B)2 C)3 D)6

accessdenied · Answer

$ \rm N_2 + 3 H_2 \longrightarrow NH_3 $
Your goal is to set coefficients so that there are the same number of atoms of each element on both sides of the reaction.
So, start with Nitrogen.
$ \rm \color{lime}{N}_\color{green}{2} + 3 H_2 \longrightarrow \color{lime}N\color{green}{H_3} $
On the left-side, we have two nitrogen atoms.  On the right, we only have one.  We need to set a coefficient on the NH3 so that it has two nitrogen atoms.  Is that clear?