Respuesta :
Answer:
Oxygen gas
Explanation:
Given expression:
CH₃CH₂OH + 3O₂ → 2CO₂ + 3H₂O
Number of moles of oxygen gas = 1 mole
Number of moles of ethanol = 1 mole
Unknown:
The limiting reactant = ?
Solution:
The limiting reactant is the reactant in short supply in a chemical reaction. To find this specie, we always us the number of moles.
From the equation of the reaction:
1 mole of ethanol would require 3 moles of oxygen gas
But we have been given just 1 mole of oxygen gas instead of 3moles.
Therefore, oxygen gas is the limiting reactant.
The limiting reactant for the reaction involving 1 mole of oxygen gas and 1 mole of ethanol is oxygen gas, O₂
Balanced equation
CH₃CH₂OH + 3O₂ —> 2CO₂ + 3H₂O
From the balanced equation above,
3 moles O₂ reacted with 1 mole of CH₃CH₂OH
How to determine the limiting reactant
From the balanced equation above,
3 moles O₂ reacted with 1 mole of CH₃CH₂OH.
Therefore,
1 mole of O₂ will react with = 1 / 3 = 0.33 mole of CH₃CH₂OH
From the calculation made above, we can see that only 0.33 mole out of 1 mole of CH₃CH₂OH given, is needed to react completely with 1 mole of O₂.
Therefore, O₂ is the limiting reactant.
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