Question

When electricity flows through water, the water molecules split into molecules of hydrogen and oxygen gas. How many oxygen (O2) molecules are produced from the splitting of two molecules of water (H2O) if the balanced equation for the reaction is as follows?
2H2O → 2H2 + O2

Answer 1

That would be one oxygen molecule.

Answer 2

Answer: The number of oxygen molecules produced are 1.

Explanation:

Water is formed by the combination of hydrogen and oxygen atoms.

Water splits into 2 types of molecules when electricity is applied.

The balanced chemical equation for the splitting of water into its molecules follows:

$2H_2O\rightarrow 2H_2+O_2$

By Stoichiometry of the reaction:

2 moles of water splits to form 2 moles of hydrogen molecule and 1 mole of oxygen molecule.

Or,

2 molecules of water splits to form 2 molecules of hydrogen and 1 molecule of oxygen.

Hence, the number of oxygen molecules produced are 1.