I believe the answer would be A I hope this helps and is correct
Answer : The balanced decomposition reaction will be:
Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.
Decomposition reaction : It is defined as the reaction in which a large molecule or reactant decomposes to give two or more molecule or products.
As per question, the ammonia molecule decomposes to give nitrogen gas and hydrogen gas as a product.
The balanced decomposition reaction will be:
2NH3(g) → N2(g) + 3H2(g
Let us write a balanced equation for the decomposition of NH3. This is illustrated below:
NH3 → N2 + H2
Next, let us balance the equation.
There are 2 atoms of N on the right side and 1 atom on the left side. It can be balance by putting 2 in front of NH3 as shown below:
2NH3 → N2 + H2
Now, we see that there are 6 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 3 in front of H2 as shown below:
2NH3 → N2 + 3H2
D. 2NH₃(g) ⟶ N₂(g) + 3H₂(g)
A chemical equation must show the correct formulas for reactants and products.
A and B are wrong, because they have NH₃ as a product.
C is wrong. H₃ does not exist.
A is correct. The equation for the decomposition of ammonia is
2NH₃(g) ⟶ N₂(g) + 3H₂(g)