27 grams of Al will react completely with how much mass of O2 to produce Al₂O₃?

8 g

16 g

32 g

24 g

Balanced equation:

4Al + 3O₂ → 2Al₂O₃

Molar masses: Al = 27 g/mol, O₂ = 32 g/mol

108 g Al reacts with 96 g O₂ → 27 g Al reacts with 24 g O₂.

Proportion:

96/108 × 27 = 24 g