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

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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

= 8.933 mol of Al

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

Hence the limiting reagent is Al.

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