If 5.0 of al react with 9.0 g of o2, how many grams of al2o3 (101.56 g/mol) can be formed

9.394 g of Al₂O₃

The reaction between Aluminium and Oxygen is given by the balanced equation;

4Al(s) + 3O₂(g) → 2Al₂O₃(s)

We are given;

We are required to determine the mass of Al₂O₃ formed.

We are going to use the following simple steps;

Moles = Mass ÷ Molar mass

Moles of Al;

Molar mass of Al = 26.98 g/mol

Moles of Al = 5.0 g ÷ 26.98 g/mol

                   = 0.185 moles

Moles of Oxygen gas

Molar mass of O₂ = 32.0 g/mol

Moles O₂ = 9.0 g ÷ 32.0 g/mol

               = 0.28125 moles

4 moles of Al reacts to produce 2 moles of Al₂O₃

Thus, the mole ratio of Al to Al₂O₃ is 2 : 1

Thus, moles of Al₂O₃ = Moles of Al ÷ 2

                                   = 0.185 moles ÷ 2

                                   = 0.0925 moles

Mass = Moles × Molar mass

Molar mass of Al₂O₃ is 101.56 g/mol

         = 0.0925 moles ×101.56 g/mol

         = 9.394 g

Therefore, the mass of Al₂O₃  formed is 9.394 g

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