Respuesta :

There are 6 N on the left side so ?=3 because 3x2=6

Answer: 3

Explanation: In the decomposition of Sodium nitride the chemical equation 2 NaN3 > 2 Na + 3 N2

So the number of atoms for Na in the reactant and product are equal which is 2. For nitrogen in the reactant it has 6 atoms also equal in the product side. So the chemical equation is balanced.

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