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In the reaction H2 + 1/2 O2 → H2O, which is the limiting reagent?

1. H2
2. O2
3. H2O
4. None of these

Correct answer: O2

Solution

The limiting reagent is determined by the stoichiometric ratio. Since 1 mole of H2 reacts with 0.5 moles of O2, if O2 is present in lesser proportion relative to H2, it will limit the reaction.

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