From the balanced chemical equation, we know that- 1 mole of hydrogen and 1 2 mole of oxygen when reacts, leads to the formation of 1 mole of water. Therefore, the reactant which is completely used up in the reaction is limiting reactant. Here 30 mL of 2 H reacts with 15 mL of 2 O and 5mL of 2 O will be left at the end of reaction. In this case, hydrogenn is the limiting reagent. So, absence of hydrogen will stop the reaction.
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