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Balance the formation of aluminium oxide.

Exercise and reference answers

Left
  1. Coefficient
    4
    Formula
    Al
  2. Coefficient
    3
    Formula
    O₂
Right
  1. Coefficient
    2
    Formula
    Al₂O₃
Instructions
Al forms a tough Al₂O₃ layer in air.

Explanation

_Source: syllabus Science, Ch 3 'Metals and Non-Metals' §3.2.1_
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