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Balance iron + steam → iron oxide + hydrogen.

Exercise and reference answers

Left
  1. Coefficient
    3
    Formula
    Fe
  2. Coefficient
    4
    Formula
    H₂O
Right
  1. Coefficient
    1
    Formula
    Fe₃O₄
  2. Coefficient
    4
    Formula
    H₂
Instructions
Hot iron reacts with steam.

Explanation

_Source: syllabus Science, Ch 3 'Metals and Non-Metals' §3.2_
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