For the following reaction, which would be the limiting reagent? 2H2 +O2 --> 2H2O You add 0.225 mol of hydrogen gas (H2) and 0.125 mol of oxygen gas (O2)Group of answer choicesHydrogen Gas (H2)Hydrogen Peroxide (H2O2)Oxygen Gas (O2)Water (H2O)
Question
For the following reaction, which would be the limiting reagent? 2H2 +O2 --> 2H2O You add 0.225 mol of hydrogen gas (H2) and 0.125 mol of oxygen gas (O2)Group of answer choicesHydrogen Gas (H2)Hydrogen Peroxide (H2O2)Oxygen Gas (O2)Water (H2O)
Solution
The limiting reagent in a chemical reaction is the reactant that is completely consumed first and determines when the reaction stops.
The balanced chemical equation 2H2 + O2 --> 2H2O tells us that 2 moles of hydrogen gas (H2) react with 1 mole of oxygen gas (O2) to produce 2 moles of water (H2O).
Given: 0.225 mol of H2 0.125 mol of O2
We can see that we have more than twice the amount of H2 than O2 (0.225 mol H2 > 2*0.125 mol O2). Therefore, we don't have enough O2 to react with all the H2.
So, the limiting reagent in this reaction is Oxygen Gas (O2).
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