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

D) 2H₂O → 2H₂ + O₂

Explanation:

Decomposition means water molecules break up into hydrogen and oxygen molecules.

H₂O → H₂ + O₂

We need to balance the equation.  There's one O atom on the left, and two O atoms on the right.  Put a 2 in front of H₂O.

2H₂O → H₂ + O₂

Now there's 4 H atoms on the left, and 2 H atoms on the right.  Put a 2 in front of H₂.

2H₂O → 2H₂ + O₂

The equation is balanced.  There are 4 H atoms and 2 O atoms on either side.

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