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The role of hydrogen gas, H2, in the formation of a water molecule, H2O is rather simple. It reacts with 1/2 mole of oxygen to form the water:

H2 + 1/2 O2 → H2O

or

2 H2 + O2 → 2 H2O

Each hydrogen in the hydrogen gas is oxidized from (0) to (+1) and is reducing the oxygen from (0) to (-II) in oxidation state.

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Q: What term best describes the role of hydrogen gas in the formation of a water molecule?
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