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Limiting reactant are defined as the reactant that is involvedprimarilyin the reaction andformation of productdepends on thisreactant. thelimiting reactantfor the given equation are as follows:A:Aluminiumis thelimiting reagent.B:Oxygengas is thelimiting reagent.C:Aluminiumis thelimiting reagent.D:Aluminiumis thelimiting reagent.Limiting reagentare those that limits the formation ofproducts, whereas the reagent present in the excess amount are known asexcess reagent.For A:For the given chemical reactions, limiting reagents are:By applying thestereochemistryconcept:4 moles of Al reacts with 3 moles of oxygen.1moleofAlwill reactmoles ofoxygen.Hence, the given amount ofoxygenis more than the required amount, it is anexcess reagent andaluminum is limiting reagent.For B:Similarly, in the chemical reaction, where 4 moles of aluminum react with2.6 moles of oxygen,such that:3 moles of oxygen reacts with4 moles of aluminum.so,2.6 moleswill react withmoles ofaluminum.The given amount ofaluminiumis more than the required amount,aluminumis considered as anexcess reagentandoxygengas is thelimiting reagent.For C:Also,16 molesofaluminumreacts with13 molesofoxygen.4 moles of aluminum reacts with 3 moles of oxygen, such that:16 moles of aluminumwill react withmoles ofoxygen.Thus, oxygen is excess reagent andaluminum is limiting reagent.For D:7.4 molAluminum reacts with6.5 moles of oxygen, such that:7.4 moles of aluminum will react withmoles of oxygen gas.Therefore, thealuminumislimiting reagentandoxygen is excess reagent.To know more aboutlimiting reagent,refer to the following link:brainly.com/question/17023950?referrer=searchResults...