Answer:
6
Explanation:
The equation given in this question is:
H₂ + N₂ ---> NH₃
To balance this equation i.e to make sure that the number of atoms on each side of the equation is the same, one would make use of coefficients.
The balanced equation is:
3H₂ + N₂ ---> 2NH₃
The coefficients are the number behind each element or molecule. According to this question, the sum of each coefficient is 3 + 1 + 2 = 6
