What reaction would be the chemical equation 2h2o-> 2h2+o2 represent? a.decomposition of water b. formation of water c. combustion of water d. replacement of water

It's decomposition
A combustion reaction involves carbon dioxide so it can't be that
The water is not being formed
The water is not replaced by the other molecules
So it is decomposition, not just from process of elimination, but also because decomposing water means heating it.

7.33 moles of NH₃ are produced in the reaction.

Explanation:

The reaction is this:

3 N₂H₄  →  4NH₃ +  N₂

Ratio is 3:4

So 3 moles of N₂H₄ were needed to produce 4 moles of ammonia

5.5 moles of N₂H₄ would produce (5.5  . 4 ) / 3 = 7.33 moles of NH₃