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What is the limiting reactant when 4.5 moles of aluminum react with 6.7 moles of oxygen gas? (4 points) Unbalanced equation: Al + O2 → Al2O3

User Richj
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1 Answer

2 votes

Answer: -

The limiting reactant is Al.

Explanation: -

Number of moles of O₂ = 6.7 moles

The balanced chemical equation for this process is

4 Al + 3 O₂ → 2Al₂O₃

From the balanced reaction we see

3 mol of O₂ would react with 4 mol of Al

6.7 mol of O₂ would react with
(4 mol Al x 6.7 mol O2)/(3 mol O2)

= 8.933 mol of Al

But the number of moles of Al present is only 4.5 mol.

Hence the limiting reagent is Al.

User ChaseTheSun
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8.1k points
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