When the equation H₂ + N₂ --->NH₃ is completely balanced using the smallest whole numbers, the sum of all the coefficients will be

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

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