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Verified Answer :

The best way to solve this is to list all the elements out and count them.

Count subscripts first (if there is no subscript then there is 1 atom)
Then multiply by the coefficients
To balance write a coefficient and multiply

3H2+N2--> NH3

H 2 x 3 = 6                H  3  (x2) = 6
N 2                            N  1  (x2) = 2


Your answer is 2 . . . to balance this equation you will need a coefficient of 2

mppalenciaa

Answer:

2

Explanation:

To balance the equation there must be the same numbers of atoms at the left side and at the right side. So, at the left side we have:

  6 atoms of H (3 x 2)

  2 atoms of N (1 x 2)

And at the right side we have:

  1 atom of N (1 x 1)

  3 atoms of HN (1 x 3)

If you multiply these last by 2, you will have:

  2 atoms of N (2 x 1)

  6 atoms of H (2 x 3)

Then, the numbers of atoms of H and N at the left side is equal to the numbers of atoms of H and N at the right side. The balanced equation is:

3H2+N2--> 2NH3

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