The quantity of sulfuric acid may not be used because sulfuric acid is excessive and aluminum is limiting.
Limiting reactants in reactions are reactants that are present in lower stoichiometric quantities in comparison with other reactants.
Thus, limited reactants determine how far the reaction can go in terms of producing products.
Thus, the percent yield of alum might have been calculated based on the starting quantity of aluminum because the latter is the limiting reactant of the reaction.
More on limiting reactants can be found here: https://brainly.com/question/14225536
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