Question

What will be the coefficient in front of the ammonia molecule?

Answer 1

1) Balance the chemical equation

$N_2+H_2\rightarrow NH_3$

2) Balance Nitrogen

$N_2+H_2\rightarrow2NH_3$

3) Balance Hydrogen

$N_2+3H_2\rightarrow2NH_3^{}$

The coefficient in front of ammonia is 2.