The decomposition of water into hydrogen gas h2 and oxygen gas o2 can be modeled by the balanced chemical equation
a) h2 + o2 → h2o
b) h2o → h2 + o2
c) 2h2 + o2 → 2h2o
d) 2h2o → 2h2 + o2

Explanation:

Decomposition is reaction where a single reactant produces two or more than two products.

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced chemical equation for the decomposition of water is :

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.

im doing test rn im going with 2 but ill give answer if itss wrong,   : )