In chemistry we represent chemical reactions using balanced chemical equations.

Question

In chemistry we represent chemical reactions using balanced chemical equations. These equations represent mole ratios and can be used to perform stoichiometric calculations. The limiting reagent in a chemical reaction is the reactant that will be totally consumed when the chemical reaction is complete. The amount of product that you can form is limited by the amount of the limiting reagent that you begin with. Here are some questions to practice stoichiometry. Al reacts with O_2 to produce Al_2O_3via the following balanced chemical reaction 4Al + 3O_2 rightarrow AI_2O_3 Discuss the following questions among your group members lf one reacts 12 atoms of aluminum and 11 molecules of oxygen. Without performing any calculations predict which one of the reactants (if any) will still be present in the reaction mixture after the reaction is completed: do you expect to have any aluminum atoms left in the reaction mixture or any oxygen molecules? Write down your group's predictions b

Explanation / Answer

1. 4Al + 3O2------->2Al2O3. Without doing the calculations, as per the data 12 atoms of Al reacts with 11 molecules of Oxygen. This suggests that all the Al reacts ( limiting reactant) and Oxygen is the excess reactant.

2. As per the reaction, 4 atoms of Al reacts with 3 molecles of Oxygen to give 2 molecules of Al2O3. 12 atoms of Al requires 9 molecules of oxygen to give 6 molecules of Al2O3. Hence, excess molecules of oxygen remaining = 11-9=2

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